Origin of stub sill 111 tank cars


What Tim relates below (as he acknowledges from the book "Rockefeller's
Secret Weapon") is the birth of the modern, stub sill, class 111 tank car, far and
away the most common tank car today. I am not sure what the first modern, (as
opposed to Van Dyke era) production stub sill car was but I think it was a
105 built in 1956 or 1957. We were able to arrange for one of the very first of
these to be donated by UTLX to the B&O Museum in 1997 when it hit the 40 year

Chris Barkan

In a message dated 4/24/04 7:48:42 AM, tgilbert@... writes:

<< In 1953, UTLX began to develop a frameless car again. This one they

called the "hot dog." It was a controversial design and, thus, was

subject to many tests. The 1953 design was instigated by an attempt to

reduce or eliminate the need for tank bands - the circular straps around

the tank attaching it to the underframe. These bands were a maintenance

headache. In the tests for the "hot dog," it was found that contrary to

accepted beliefs, the surge of liquids on the tank-heads in a partially

loaded car was less than one which was full. If that was the case, then

the need to have a dome was unnecessary - the expansion dome was

originally designed to reduce the pressure of a fully loaded car. In

1956, the "hot dog" underwent extensive tests conducted by the AAR and

passed with flying colors. It took a bit longer (1961), however, to

eliminate the requirement for side running boards. In 1959, UTLX built

four 21,700 gallon tanks - almost doubling the maximum capacity of tank

cars; in 1960, 30,000 gallons became the maximum. The "Hot Dog" became

obsolete in 1961 when UTLX produced the "Compact-30" car a car of equal

capacity, but considerably shorter.

The above is paraphrased from pages 344-352 of Carr's ROCKEFELLER'S


Tim Gilbert>>