2/20/2010, last updated
The front and tender trucks are equipped with air/steam operated brake
cylinders. There was no room for a brake cylinder on the middle
truck so it was decided to make the brakes on the middle truck
mechanically operated park brakes. This page describes the park
|The photo at right shows the park brake handle which is
located beside the Johnson bar. The handle is essentially
identical to the Johnson bar except that the paw is sloped so
that the handle can be pulled back without lifting the paw.
The paw must be lifted to release the brake.
|This is a close-up of the paw and the linear ratchet.
The ratchet was made from 1/4" square bar. The ratchet
teeth were cut with a saw and then smoothed with a file.
|This shows the Johnson Bar and park brake lever from the
rear. The park brake lever is next to the cab side and
hopefully won't be too noticeable since it is not prototypical.
While the handle is essentially identical to the Johnson
Bar (See Johnson
Bar), it was made from a drive shaft that had been cut too short.
Photo above shows the park brake shaft and arm as viewed from below the
The shaft is 3/8" diameter CFS stock and the arm is made from 3/4" X
3/16" HRS flat stock. The arm is silvered soldered to the shaft.
| A pair of the bearing blocks
shown on the right support the ends of the shaft. Flanged
sleeve bearings (3/8" ID - 1/2" OD) are fitted in each bearing
block. A pair of shaft collars(McMaster) keep the shaft
The park brake works great!