Although Chao Phraya River in Bangkok, Thailand, is often seen through visitors’ eyes, it is primarily considered a transport corridor by Chao Phraya Express Boat, which offers a high-frequency service closer to metro, tram, or commuter rail than to sightseeing. Supapan Pichaironarongsongkram, the company’s chairperson, describes Bangkok as a “city of waterways”, with the river long serving as one of its main transport arteries.
The company’s fleet of 47 boats provides around 100 scheduled trips daily from 06:00 to 20:00, linking 35 piers over a 31-kilometre corridor between Pak Kret and Wat Rajsingkorn. “Travelling by water avoids road congestion, allowing travel times to be predicted accurately,” says Supapan. “It is convenient, fast and affordable.”
Chao Phraya Express Boat is part of Supatra Group, the family business that has grown into 13 companies spanning boat services, retail, hotels, restaurants and advertising, while remaining closely connected to the water.
Supapan has been in the business for 55 years, having been appointed managing director at the age of 26 after her mother, Khunying Supatra Singholaka, acquired the public river bus operation from Thailand’s Ministry of Transport and established Chao Phraya Express Boat in 1971. She represents the third generation of women in the family to helm a maritime business – her grandmother, Khunying Boonpan Singholaka, founded a cross-river passenger boat company near the Grand Palace over a century ago. Supapan’s daughter Natapree has now joined the business too.
Reflecting on how unexpectedly she took the helm, Supapan recalls: “I was armed with a bachelor’s degree in liberal arts, mainly languages, and had no knowledge of the marine industry. There are no secrets to our success, just the willingness to put our best efforts into everything that we do.”
Some of the earliest cross-river ferries run by Khunying Boonpan (Photo: Chao Phraya Express Boat)
Today, the group’s boat activities cover express boats, cross-river ferries, and the Chao Phraya Tourist Boat hop-on hop-off operation. Supapan describes the scheduled express boats as “like buses plying regular routes”. The service carries a predominantly local market, with commuter and tourist traffic split roughly 70:30. The group’s three boat companies carried around 12 million passengers in 2025, with Chao Phraya Express Boat itself averaging more than 5.6 million passengers per year.
As in any commuter transport operation, local traffic concentrates in the morning and evening peaks, between 06:00 and 09:00 and again from 16:00 to 18:00, while tourist demand is more evenly spread during the day. “Both commuting passengers and tourists share the same fundamental need: safety,” says Supapan. “Commuting passengers need speed of travel and low fares, while tourists prioritise a relaxing panoramic view experience over cruising speed.”
This dual role shapes the fleet and service pattern, with Chao Phraya Express Boat operating under coloured flags that indicate stopping patterns, distances and fares. The coloured-flag services partly overlap but serve different start and end points. Further route development remains possible, Supapan says, but “increasing service frequency must be aligned with passenger density and demand”. Operationally, it is closer to urban transit than a conventional ferry route.
Integration with Bangkok’s wider transport system also matters because Chao Phraya Express Boat functions as a feeder network for passengers travelling from the northern and western outskirts towards the city centre. “Most passengers travel from the outskirts into the city,” says Supapan, explaining that many use the boats to connect with other transport systems. The government is working towards a common ticketing system that Chao Phraya Express Boat expects to join, but passengers can currently pay by cash, Rabbit card or QR code.
Chao Phraya Express Boat’s services take commuters and tourists past Bangkok’s iconic landmarks like Buddhist temple Wat Arun (Temple of Dawn) (Photo: Chao Phraya Express Boat)
The commercial framework behind this public transport role is more complicated. “Chao Phraya Express Boat operates without any government subsidy,” says Supapan, adding that state-owned public piers are free to use, while both scheduled public passenger boat fares and five-year per-vessel licences are regulated by the Marine Department. “Fare regulation is a key reason why water-based passenger transport has not been able to develop to its full potential.”
The river is demanding because passenger boats, cross-river ferries, cargo craft, tugs, dinner cruises and sightseeing vessels share the same waterway. When it comes to scheduled services, Chao Phraya Express Boat operates alongside its sister tourist boat operation and Thai Smile Boat, but Supapan is clear that “competition among operators must remain at a level that does not compromise navigational safety”.
Pier management is complex because public piers are mostly owned by the Marine Department, although some belong to temples or private owners, and many are shared. Supapan points to “the density of vessels on the river” and the need to manage “a large number of boats of all types and sizes”. Managing dwell times, passenger flows and traffic types requires landside public transport discipline, which is complicated by currents, wash and limited berthing space.
Fleet design reflects those constraints. The 47-boat fleet includes 26 single-engine wooden monohulls built between 1992 and 2005, 11 twin-engine wooden monohulls dating from 1996 to 1999, four air-conditioned aluminium double-deck catamarans delivered in 2020, and steel and aluminium monohulls built in 2024 and 2025, with four more due by October 2026.
With the express boat fleet averaging about 24 years, renewal plans are dictated by more than age alone. The design envelope is shaped by bridge clearances, pier geometry, river width, passenger volume, wash, fuel efficiency and ease of maintenance. “The most important design criterion is the safety of the vessel in service,” says Supapan. Smaller vessels may be better for high-frequency services with lower demand, while tourist craft require a different balance of capacity, amenities and appearance.
Electrification is now the strategic thread running through that renewal programme, even though Chao Phraya Express Boat does not yet operate its own electric passenger vessels. From 2022 to 2025, however, it operated electric craft on behalf of the Bangkok Metropolitan Administration on the Saen Saep Canal extension, gaining first-hand experience with electric propulsion, operating profiles and maintenance requirements.
The next step will be deliberately phased, with Supapan explaining that “the company plans to invest in electric vessels, beginning with small craft for canal tourism or shuttle services between hotels and tourist attractions”. Larger electric passenger boats on the Chao Phraya River would follow, with 10 to 15 river vessels potentially being introduced depending on cost and operational limitations.
Retrofitting is also under consideration, particularly because the latest batch of 10 steel vessels could be converted from internal combustion engines to electric propulsion. The company also envisages five to 10 purpose-built electric vessels. Over time, Supapan expects the fleet to comprise both engine-powered and electric craft, with a planned core of around 20 to 30 vessels.
As so often with ferry electrification, charging infrastructure will determine how electric craft can be integrated into the timetable. “Charging infrastructure is, of course, a critical matter,” says Supapan. Chao Phraya Express Boat has studied two or three charging locations, covering the route’s northern end around Pak Kret and Nonthaburi, and its southern end around Wat Rajsingkorn. Grid capacity, power management and pier space for charging all remain important considerations.
Route length and frequency add complexity because electric operation depends on range between charges. “Route distance, charging time, battery capacity, investment cost and pier infrastructure are all interrelated,” says Supapan. To reduce charging stops, an electric vessel may need sufficient range for two roundtrips, or 40 to 64 kilometres per trip. That means larger batteries, increasing weight, cost and charging time. Hybrid propulsion remains under discussion, with generator sets feeding electric motors and batteries. Supapan says the main limitations for electric vessel services are “the operating range per charge and the charging time”.
Tourists can enjoy sightseeing from the ferries as they travel down the river (Photo: Chao Phraya Express Boat)
Supapan’s six years on the Interferry board have reinforced her view that ferry operators around the world face similar questions about safety, standards, environmental performance and business viability. Chao Phraya Express Boat will host the association’s 50th anniversary conference in Bangkok from 31 October to 4 November 2026, and Supapan expects it will be less of a showcase and more an exchange of practical experience. “The single most important issue is safety in navigation in every dimension,” she says. Across the industry, she adds, operators share the need to provide good service, meet passenger expectations, care for the environment, and still achieve sound business results.
For Chao Phraya Express Boat, the immediate future is one of careful modernisation: renewing the fleet, fitting cleaner technology into a constrained river, managing peak demand, keeping fares affordable, and operating without subsidy. The setting is distinctive, but the strategic questions are recognisable across the ferry industry.
Discover more insights on the passenger shipping industry in the Autumn/Winter 2026 issue of Cruise & Ferry Review. To get content like this on a regular basis, subscribe to the print editions or free digital editions of our Cruise & Ferry publications.