Lets look at a few..
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Unknown low floor at Manchester Shops, for unknown reason...
5002 sitting at Dairy Queen on the 21A Coraopolis.
5018 on Rt 54C nearing Allegheny Square.
5047 heading back to West Mifflin garage, making the turn from Stanwix St onto Allies Blvd.
5145 somewhere in Oakland on the 77G Route.
Port Authority decided to repaint some of these buses, and this is what they came up with...

5040 on the 61A route.

5043 on the 86A in her new blue color with a TON of "G"s on it!
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5135 done up in "hybrid orange" not too bad..

5022 sporting new paint...running up Liberty Ave.

5059 dressed in light blue, by USX Plaza.

5091 with its fresh paint in front of the Manchester office.

5102 emblazoned with new paint and "move" all over it.

Collier Divisions 5111 on Oliver St.

5115 turning onto Oliver from Wood St.

5155 slowing at the end of the EBA.

5006 in Oakland, sporting an ad wrap.

Ross 5009 in process of getting new paint...

5027, on the 16D, in Cherry red. Bus is at 6th and Liberty in Pittsburgh.

5037 rolled out with brand new shiny paint in front of Manchester.

5069 somewhere around the West Mifflin Garage.

5092 in a funky orange color, around 4th Ave.

5094 advertising Mike Tomlins Show on FSN.

5153 in powder blue, on 6th Ave at Grant St. I think this is a sharp color!

This is 5160 in a striking lime green. can't miss this when you park it!
Here are some interesting shots of the 50XX series bus being built at the Neoplan factory.
More to Come!!!