Another long lost railroad trailer found in the area! A Reading trailer?

If you follow my posts regularly, you know I love to find old railroad relics that are still use today.  I stumbled upon another railroad trailer in the area and it's on the way to work.  Over the years, I've found these two trailers still in use today:

An old 40' Rock Island/RF&P trailer used for old tires at a local BJ's Warehouse and a Santa Fe piggy back trailer used for wood chips are a local sawmill:
Trailer pics

Here's the model of the Rock Trailer:
Rock Island Trailer model

This new trailer I found looks like it's been here a while as I have drove past it for years on the way to work.  It's a Reading trailer and the pic was not easily taken.  It's in someone's yard and I'm not pulling into their yard just to take a picture.  So, the one handed cell phone pic at 35 MPH was called for.  Took 3 days to get the best picture!  Could not find another picture of the exact trailer but a few with diamond logo. I never knew Reading had trailers!

First attempt at the drive by pic.  Darn sign and I need to zoom in a bit!

Second attempt at the picture.  Zoomed in a bit.  Neat diamond logo.

Today's picture.  The sun even cooperated.  Guess this trailer is from the 60's?