Two more Hump & Retarder books online, two more to go…

There’s some photos from DL&W’s Hampton Yard (Near Scranton, PA), including a few night photos, dated from 1937.

And some construction photos like this one, which answer the age-old question of how many cranes it took to install a car retarder – at  L&N’s Hills Park/Tilford Yard.  🙂

You’ll also find this photo of Illinois Central’s Markham Yard machine being tested in Dept. 58 at Swissvale, along with other shots of the machine and test racks:

And finally, lots and lots of photos of the Velac equipment drawers, circuit boards, and RF units from Canadian National’s Montreal Yard.  RF units like these were used to transmit a radar frequency and to detect the difference (Doppler) frequency between the transmitted and received signals to detect the speed of the rolling cars.  Further reading about the Velac VR-1 system can be found here.

R thru U coming soon.  Enjoy!