(DCC/Sound) HO Scale Diesel Rapido BC Rail M420 #642

The M420 was powered by the ALCO 12V‑251C3 prime mover, delivering 2,000 horsepower. Most units rode on MLW’s distinctive ZWT (Zero Weight‑Transfer) trucks, with one notable exception: the five locomotives built for the Providence & Worcester. Those units used ALCO trade‑in FA trucks, requiring a unique bolster design and altered truck spacing, making them stand out from the rest of the fleet.

Between May 1973 and February 1977, MLW produced 103 M420s for four railways:

• Canadian National: 80 units

• BC Rail: 16 units (including eight B‑units)

• Ferrocarriles del Estado: 2 units

• Providence & Worcester: 5 units

CN received its locomotives in three groups:

• MR‑20a (2500–2529): delivered in 1973

• MR‑20b (2530–2559): delivered in 1974

• MR‑20c (2560–2579): delivered in 1976

All CN M420s were retired by 1998, with many finding new life on short lines across North America.

M420 Locomotive Features

• 3D scanned from a real M420 for maximum accuracy

• First run includes MR‑20b and MR‑20c classes

• Rapido’s dead‑straight metal side handrails with plastic stanchions

• Exceptional underframe detailing, including traction motor cables, piping, rerailer, and a remarkable number of separately applied parts

• Choice of two‑ or three‑panel radiators, louvered or large‑opening electrical cabinet doors, and open or closed truck bearings

• Factory‑installed grab irons and handrails

• Operating headlights, rear lights, tri‑colour class lights, and illuminated cab control stand

• Highly detailed cab interior with optional open front door

• Available as DC/Silent (21‑pin DCC‑ready) or DC/DCC with ESU LokSound

New Features

• CN 3500‑series: rebuilt long hood with knuckle‑buster door latches, paper air filters, retention‑tank ditch lights, and relocated horn

• BC Rail: correct fuel tank size and placement, four rock lights (nose and pilot), and rebuilt steps

• B‑units: available as part of A/B sets, with single A‑units sold separately

• P&W version: correct AAR trucks and headlight configuration