Andy has provided us with a bunch of great models. The 8214 (3 rail) and 9214 (2 rail) is one of my favorites.
To the best of my knowledge there have been three runs of these red, black and white Hooker tank cars and each run had had two car numbers. The plants and road numbers for the 8214/9214 series are as follows.
8214-1 Tacoma, Wash. SHPX 3336
8214-2 Tacoma, Wash. SHPX 3337*
8214-3 Not Observed*
8214-4 Niagara Falls, N.Y. SHPX 7422
8214-5 Tacoma, Wash. HOKX 711
8214-6 Niagara Falls N.Y. SHPX 7424**
* Note: I do not have these cars in my collection. My information is based off of web sources. If you have these cars please help us confirm or correct this data.
** Special collectors note. Three 9214-6 cars with a factory decoration error were produced numbered SHPX 7424 but lettered for Tacoma, Wash.
Also note that Atlas has produced this paint scheme in the Industrial rail line Numbered SHPX 3336 and 3337. They are the 1005008-1 and -2. The quality of the decoration is excellent. These are great little cars and an excellent value.
Normally the cars were returned to their regular plant when empty but I think we can justify "balancing" cars between plants from time to time.
The Hooker Tacoma plant was the first Chlor-alkali plant on the west coast. As such they had a significant shipping cost advantage for several years in supplying their products to west coast industries.
The Chlor-alkali process, which hooker helped to develop in the early 20th century, takes salt water (NaCl and H2O) and through the use of direct electrical current turns them into caustic soda (NaOH) and chlorine gas (Cl2). Hydrogen in a byproduct of the process and it can be combined with chlorine to make hydrochloric acid (HCl) or with nitrogen from the air to make ammonia (NH3). All those chemicals can be shipped in tank cars and we have models to represent them for Hooker.
Atlas has made a bunch of cars lettered for Hooker. They include 11,000 gallon/50 ton cars for chlorine and anhydrous ammonia service as well as 17,000 gallon/90 ton tank cars for chlorine.
K-Line, Lionel, MTH and Weaver have also made Hooker tank cars in their O scale product lines. If people are interested we could do an O scale Freight Car Guide to Hooker freight cars in the future.