If you plan to work on newer equipment, you may want to get some JIS and/or Pozidriv screwdrivers. These screwdrivers (and the screws) are easily mistaken for Phillips head.
When one uses a standard Phillips head driver on a JIS or Pozidriv screw, the driver often lifts out of the "slot" and strips it.
Here is a Wikipedia article on drive types.
During the modern era, Lionel appears to have used both Pozidriv and JIS screws. If you ever work on imported electronics goods, they might come in handy there too.
My Pozidriv screw drivers are Wiha.
My JIS screwdrivers are made by Vessel and Moody Tools.
Both Pozidriv and JIS screwdrivers are a bit more difficult to find. Wiha makes Pozidriv, but not JIS. Sears Craftsman makes neither. I just checked Snap-on, they also have Pozidriv but not JIS. Moody Tools makes a precision sized JIS set.
So the JIS ones were the most difficult ones for me to find. I purchased a set of the Moody Tools one from Amazon.com, and decided I wanted a standard sized set.
In the end, I purchased my full sized ones from McMaster-Carr.
