Pipe Loader

Action Cars and Accessories
Chug-Chug Sound in Box Car
Cattle Car and Depot Set
Crane Car and Boom Tender
Crane Loader
Crossing Flasher
Crossing Gates
Crossing Gate
Dump Cars
Electronic Sound of Steam Box Car
Floodlight Car
Freight Unloading Depot
Giant Operating Crane
Gold Mine
Gravel Conveyor
Grain Elevator
Hopper Car Unloading Set
Horse Car & Depot Set
Log Dump Car Set
Log Loader with Log Car
Ore Dump Car Set
Ore Dump Set with Nite Glow
Operating Log Dump Set
Piggyback Flat Car Set
Piggyback Loader/Unloader
Operating Piggyback Loader/Unloader
Pipe Dump Car
Pipe Loader
Signal Man
Steam Whistle in Billboard
Tractor Loader
Unloading Box Car Set
Unloading Mail Car Set
Brown Box Era HO-Scale Trains
Operating Pipe Loader

TYCO Operating Pipe Loader No.951

Operating Pipe Loader 

TYCO catalogs the Operating Pipe Loader (No.951) only in the 1981 catalog.  Though similar to the later Operating Pipe Loader (No.958 and 958B), this 1981 example is not shown with the "Mid-Atlantic Pipe Co." lettering and is not orange and brown, but blue and gray.  The original Pipe Loader also includes a push-botton plunger control with black tube that, though use of air burst, allows a pipe section to roll forward off the loader.  The Operating Pipe Loader carrying the 951 stock number is only found in the 1981 catalog and that example is a drawing and not an actual production run item.  Above is a picture of the actual Operating Pipe Loader in box.

TYCO Operating Pipe Loader No.958

Operating Pipe Loader with Pipe 
-No.958 and 958B

Beginning with the 1982 catalog, TYCO again features an Operating Pipe Loader with Pipe, but now the item carries the stock number 958 and differs in appearance from the '81 example.  From 1982 through 1986, the Pipe Loader remains the same orange frame with brown loader on a gray plastic base.  The Pipe Loader included stickers to label the item for "Mid-Atlantic Pipe Co." and included four Pipe Sections.  The Pipe Sections are a familiar and well used staple in the TYCO line, having originated with the 40' Flat Car and Freight Unloading Station in the 1960s.
Though there is some crossover and sharing between product lines, the Culvert Pipe Loader with Pipe (No.3436) from TYCO's US-1 Trucking line is not the same piece sold in the train line as item 958. 
The "B" addition to the stock number refers to a free Lighted Bumper Track (No.454) included with this item during the final years of its inclusion in the TYCO line.  Though this item is last found as a separate Action Accessory in 1986, it does continue to find itself in the contents of train sets through 1993.