What’s that sound? That is the Barco M-23 Power Reverse Gear from C&NW #1385 following refurbishment.

What’s a power reverse gear? It is a pneumatic cylinder that is used to control the position of the valve gear on the locomotive. Not only does it control the direction of the locomotive’s movement but also how much power the locomotive can make.  

When #1385 was built she rolled out of Schenectady with a manual reverse lever or “Johnson Bar.” As shown on the evaluation card, the power reverse gear was added in January of 1942 as one of the many improvements the C&NW made to the R-1 class, including our engine. The power reverse is a much safer way to make adjustments while the engine is in motion and allows for much finer adjustments at the same time.

Some refurbishment of the gear was necessary. That task was made much easier with the help of Dennis Daugherty sharing his vast reference library. Included was a 4-part text on Railway Locomotive Maintenance by F. E. Kardes from the 1940s. This text listed specific details on the Barco equipment, such as machining tolerances and setup details.

Once repairs were completed, the reverse cylinder was clamped to an assembly table and the reverse quadrant was clamped to the roll cage of the forklift. This was done in the same relative positions they will be in when installed on the locomotive. An air line was attached and the cylinder to allow the reverse gear to be put through its paces. We now have another piece of the #1385 puzzle ready for service and awaiting attachment to the boiler.