@Rockershovel posted:I’m not familiar with these locos - could you explain the reference to “articulated frame”?
Jack can probably answer this better. There was a whole bunch of experimental stuff built into the A-1, and the T&P 600s came right after that. I’ve heard several reasons why, but the main frame ends at the back driver. The firebox is supported over top of the trailing truck and the drawbar attaches directly to the back of the trailing truck. It’s a bit of a Frankenstein design that caused no shortage of problems and Lima moved away from it quickly. A few of the 600s were upgraded to a new full frame, delta trailing truck and roller bearings towards the end, but none were saved. It improved the engine but not enough to starve off dieselization.
