Kali wrote:What other odd cargos were there?
Vinegar cars also came in a single-tank variant. From what I've seen, the horizontal tank variants, whether single or double, tended to be more common.
There was a similar type of car, which I've only seen in a single-tank configuration, that was used to carry yeast. A wooden tank was used both to maintain a more consistent temperature, and because the yeast would have been badly damaged by any of the metals commonly used for tanks in those days. I remember seeing yeast cars in service as late as 1958, but I understand they lasted a bit longer than that.
Helium was another interesting, if far less common commodity. The US Navy had (and may still have) a monopoly on the helium supply, and transported it in cars consisting of long, narrow gas bottles stacked horizontally. The surrounding superstructure included a full roofwalk. Among the more unusual of the variety of the cars the Navy had in interchange service was a fleet of purpose-built flatcars for the transportation of large gun barrels. A WWI-era car designed for transporting the 14" gun (Note: for those unfamiliar with large boresight weapons, this refers to the diameter of the shell, the barrel itself being substantially larger) was one of the earliest four-truck flat cars on the continent. The Army also had dedicated cars for this traffic.
Milk cars came in a rich variety of configurations before the traffic dried up. These ranged from conventional baggage compartments, for carrying milk cans relatively short distances, to purpose-built insulated boxcars, to cars designed around two glass-lined tanks in the last years. The last of these types included the Borden "butterdish" flat cars and Hood's tank cars that looked like steel express cars. Conventional express refrigerators were also used in milk service.
One of the most interesting and unusual commodities was dry ice. This was transported in unique refrigerator cars with tapered sides, the dry ice being loaded through a collection of small doors located just below the cantrail. There were three principal variants of this design, the largest fleet being operated by Mathieson, with Liquid Carbonic also having operated some.
Ventilated boxcars were developed for produce traffic, and are typically spotted by the presence of two doors, only one of which was used at a time. In addition to a conventional door, there was barred door reminiscent of what might be more familiar in a prison. In at least some cases, there were other doors or hatches to provide additional ventilation. These cars tended to be phased out as refrigerator cars became more common.
Less obvious was other forms of traffic for which conventional car types were adapted. For example, grain tended to move in boxcars with boards over the bottoms of the doors, or in latter days, with special grain door adapters. A regional specialty, along the Gulf Coast, was the sugar cane traffic that moved in old single sheathed boxcars. KCS maintained a small fleet of these into the late '60s, that I recall. The finished sugar might then be shipped out in conventional covered hoppers, or bagged and packed in boxcars. CP and others maintained dedicated boxcars for newsprint service, in order to minimise the risk of damage.
The mention of live fish traffic was particularly intriguing. I was surprised to learn that the Soviets were still building cars for this traffic into the early-'60s, according to one report I read. The design, which looked like a truncated version of their standard passenger car design, enclosed a large tank, a power plant, and an apartment for a crew of two. Given the distance between the fishing fleets in the Pacific and the large cities on the western end of the continent, it's clear the crew would have had plenty to keep them busy.