Sep 1, 2016
When Conrail took over operations back in 1976, they retired many of the first generation diesels that had been in hump duty, leading to a major shortage of those engines. In a Railroad Model Craftsman article, Ken Goslett mentions how Allentown hump went from using CNJ RSD-4's to leased BAR Geeps and P&S switchers. By 1978, however, Conrail's "real" hump engines had become their former Penn Central SD38's. Still, a pair of painted-out PC SD9's worked the Allentown hump for quite a while after the leased power left. Over at the Rutherford hump, a pair of GP30's did duty on one end until the hump closed.
In 1978 and 1979, Conrail decided to construct a fleet of slugs using worn-out Alco RS-11, RSD-12, and RSD-15 units. Conrail removed the diesel engine, generator, and cab from the original units. The underframe, trucks, traction motors, and blowers remained. The hoods were chopped down and patched up. Details of individual slugs varied depending on the original unit and what the shops had on hand. Those slugs that came from four-axle Alcos were classed as MT-4's (Motor Trailer 4-axle).
By May 1999, only 4 MT-4's remained on roster. These units were transferred to CSX and Norfolk Southern on June 1, 1999. The other units had been sold to other railroads or scrapped.
Comprehensive MT-4 Roster [Download PDF Version ]
The roster below covers those units operated by Conrail from the creation of the first unit in 1979 to their final retirement, along with first disposition. Roster source the Diesel Shop, X2200 South, Conrail Historical Society, and various railfans.
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