for these black blocks, brush by hand and it will look right.
try using dark dark gray, almost black dark gray. It will look more scale when finished.
for this RR information and 'BLT DATE' info box, hobby shops and online retailers sell RR decals in scale.
craft stores such as Joanns and Michaels sell dry transfers in different styles and sizes.
also for the 'BLT DATE' info box, search through old decals from model aircraft kits of yours or your buddy's, or ebay to create you own.
a little bit of cutting with a hobby knife will be necessary
hope that helps