This device covers only the ALCoWorld website! You might try
for searches within the entire web.
Specifications, like DL500, are normally used without a dash
(DL-500). But it could happen that you get additional hits by trying
it with a dash as well. Blanks aren't used at all.
Just the other way with model numbers, like C-636, here's a
dash common on this page. However, as I frequently use texts and news
from different sources there are model numbers without the dash. So,
my advice is using just the plain number to get all the referring info
that's available on ALCoWorld.
At last: it's no good idea to include the word "Alco"
in your search. This will list you every page of ALCoWorld! Same with
"trains" or "locomotives", it's all about trains
and locomotives here, isn't it? Seems to me just like asking a
bartender if he has something to drink.
Have fun digging!