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HO Scale ACF Flexi Flo

This is a pre-order product that will be made to order. Reserve yours today with zero money down. Minimum order is two cars.

Available as multi-packs or single cars (mix and match a minimum of two).

Prototype Information

Rapido Trains Inc. is very pleased to announce the iconic ACF PD3500 Flexi Flo hopper in HO scale, already one of our most eagerly anticipated models ever.

Built between August 1964 and June 1966 the American Car & Foundry (ACF) 3500 cu.ft. covered hopper was an early innovator in pressure differential unloading and a marketing masterclass thanks to the "Flexi Flo" tag coined by the car's biggest customer, the New York Central railroad.

CR 897848 at Northumberland, PA - Rudy Garbely Collection

Other than seven cars built for Shippers Car Line (SHPX), a subsidiary of ACF, the NYC was the only purchaser of the PD3500. They made up for it in quantities, with a total of 220 cars rolling off the Milton, Pennsylvania, production line over three subtly different batches.

Still new at the time of the Penn Central merger, many cars were simply repatched with PC prefix and logo and renumbered. However, plenty made it through those turbulent years with their full NYC paint unspoilt. Come the era of Conrail and many cars were repatched again, making them a rolling north-eastern railroad history lesson as patches faded showing PC and NYC logos beneath the famous "canopener"! Many others were repainted, with Conrail applying at least three different schemes.

If there is any lingering feeling among railfans that these cars were captive to the north east then the 1980-90s should dispel that misconception as the cars spread their wings, first through the transfer of many cars to Conrail's Merchants Despatch Transportation Co. (MDTX) subsidiary, and then the later sale of cars to NAHX (for Lafarge) and SXSX/SYSX for use in Arizona, California and the south west, all gaining new paint schemes in the process. By 2000, an explosion of patchouts had taken place with a plethora of different reporting marks popping up and no part of the USA off limits. They were even more common in many parts of Canada! Many were still in use well into the mid 2010s, only being retired as they fell foul of the 50 year rule.

This is the first time that the ACF PD3500 has appeared as a high-quality plastic model and Rapido intends to do this classic and much requested design justice! The body of the Flexi Flo evolved rapidly during its two years of manufacture and the Rapido version replicates all these changes, including different strengthening rib and weld line arrangements. We are also debuting a brand new 125-Ton Barber S-2 truck used under many of the NYC cars.

NYC 885711


Other details are as follows

  • Three body styles & two top hatch sizes
  • 100-Ton & 125-Ton Barber S-2 trucks
  • Etched metal running boards
  • Both wire and injection-moulded grab irons
  • Fully detailed underbody with full discharge piping
  • Brake equipment and piping variations
  • Factory-installed air pipes and coupler cut levers
  • Metal Macdonald-Cartier knuckle couplers



Rapido Trains Inc. is a high-end manufacturer of model trains and accessories in HO, OO and N (North American 1:160 and British 1:148) scales. Our aim is to recreate the entire rail travel experience, from fully-detailed interiors and underframe equipment on our trains to fully-wired telephone poles for your model railroad.