According to:
http://www.dix.army.mil/pao/Post02/post081602/dinky.htm
" When the narrow gauge railroad was built at then Camp Dix in 1922, the smaller trains, affectionately referred to as Dinky, ran on tracks just under 24-inches wide, less than half the size of standard rail tracks.
According to the book titled Narrow Gauge to No Mans Land, by Richard Dunn, the U.S. Army’s 1st Engineers “had little difficulty constructing the railway over the relatively flat terrain” selected for the project in 1922.
The original length of the track was seven miles long, but eventually grew to 17 miles by 1946 when the train stopped running.
During the height of the Dinky reign, 11 steam locomotives and one gassed mechanical had moved along the ranges at the beginning. The number of cars associated with these engines fluctuated over the years but by the beginning of World War II in 1940, it appears there were 92 cars on post. Of those, 39 were passenger cars, 12 freight cars, and one observation car to oversee training on the ranges, according to Dunn’s book.
According to Zimmerman and Warrick, park officials during the meeting expressed to Fort Dix that park officials would like to move the selected engine prior to Labor Day weekend, however that is not expected to happen.
The Dinky Railroad restoration project started more than 10 years ago. At that time, post officials signed an agreement with Pine Creek Railroad to relocate one of the engines to the post at that time.
On Pennsylvania Avenue, outside the Fort Dix museum, space was allotted and trees were planted to embrace the outdoor display. However, funding was withdrawn for the project when Operation Desert Storm started.
Since then, the plan was shelved and had remained in discussion phases at the installation. Those involved with the project believe the Dinky Railroad played a very significant role in training thousands of soldiers for World War II. On post, a very small part of the train’s history still, which is today a small walkway, that still exists near Range Control."