I am just trying to follow a progression of steps. The order can be different based on a person's background, experience, and knowledge - I have listed Steps in the order I would probably have progressed through - i.e., if Step 1 shows no change, do Step 2. Step 2 shows no change, on to Step 3 - I think you get the idea. One thing I was often good at was asking questions of the people I worked with, be they hardware people or software people, that jogged something in their memory that led to a solution.
Step 1) Swap in new PCB - You did this with no change in operation reported.
Step 2) Put suspected PCB in a know working engine? Runs okay on same track that "delayed startup" engine is run on?
Step 3) Testing power path from Track to PCB
Step 4) What is plugged into the PCB, besides power from the track? Can I remove one plug at a time from the PCB to see if the operation changes?
Step 5) Did you change the track power source between the time you had the normal operation and the "delayed startup" operation? i.e. - change transformer the transformer that supplies the power. (example: change from postwar ZW to ZW-L)
These are the 5 Steps I can think of at this time. You did Step 1 with no change in operation, so maybe the other Steps will help shed more light on your problem
