Drill & Tap size for Aristo/USA track srews?

[smcgill (Sean McGillicuddy)]

My Drill & Tap size markings have faded.

What is the Drill & Tap size used for the screws used on Aristo and USA track?

2mm by ?
I would like to re-label them.

Thanks.

Sean

[rich413 (Richard)]

I believe it is 2x .4mm . drill size is 1.6 mm or #52