I made the body panels for a couple of boxcars while recuperating from my hip replacement. When I was more mobile I put the boxcars together.
As I knew I was going to be laid up for a while before I went to hospital I cut out the chassis floor because and as I used pieces of timber for the underframes all I needed was my;
small mitre box
razor saw
some PVA glue
a cutting mat
some paper clips to act as clamps
pin vice and drill set.
I also made my bogies out of styrene so I used my;
tin snips to roughly cut out the shape
a small hand drill with bits to drill out holes
files to shape holes and smooth off rough edges
These and a lot of the things mentioned above.
Sitting filing pieces of plastic is very calming, passes the time away and keeps the mind active, it all depends on how much activity you can do.