There appears that there may have been at least two jigger track arrangements. Look at these photos. One shows some sort of ramp (and turntable?) Note also a walkway or platform in front of the door.
In the other photo (which appears to be the same crew as the photo that Linda provided) there is no platform, no turntable, and the jigger track is just the two rails.
Personally, I like the ramp/turntable/platform configuration - it's much more interesting.