That's one thing I like about the Lima models, they are easy to strip down and service. Running can be improved by adding additional pick-ups. Though basic by todays 'standards' as others have mentioned, they are sturdy and robust and you are free to add as much or little detail as you wish.
Before Hatton's closed down, I used to look at the pre-owned Lima items and would occasionally buy a non runner with the intention of stripping it for spares for the rest of my Lima fleet. However, on receiving the model most times all that was required was a broken wire needing to be re-soldered and a good clean of the mechanism and wheels.
In fact I tend to run my Lima stuff more than the more recent detailed models.