David
I believe there have only been two depots in Lowell. The original wooden depot was expanded with additional area in the freight section, but I honestly have no idea when that addition was done. This wooded depot was demolished by the wreck , May of 1952. It was first flattened, then burnt to ashes in the fire. The brick depot that remains is #2. That was built in 1952-53 and dedicated in 1953. Technically, if you count the temporary depot in 1952, there were three. Me, I don't count ex-RPO or passenger cars used as temporary structures.