P1K C-Liner as industrial switcher

[FCIN]

Proof there is a prototype for everything. While I would call it an F7B as you do, is it really a B since the B stands for booster.

It was indeed an F7B. It was built in 1949 as an F3B and later upgraded to F7B. Unit was Clinchfield Railroad F7B No. 852, retired April 1970 and sold to the Haysi Railroad in April 1972. It was equipped with radio control and a "makeshift cab". Quite unusual to say the least and a one of a kind as far as I know.