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Here is what I found comparing the AAR classification to the ICC designations:

Class "T" - Tank Car types

Tank car means any car which is used only for the transportation of liquids, liquefied gases, compressed gases or solids that are liquefied prior to unloading. Car maybe w/o underframe if superstructure is designed to serve as underframe. If car has underframe, it must be designed only for the carriage of one or more enclosed containers ( w/ or w/o compartments) that form the superstructure and are an integral part of the car. All such containers must be securely attached to the underframe when offered for transportation but may have demountable features. Before any car may be considered a tank car hereunder, the design of all such containers must have be approved by:

1. the AAR Committee on Tank Cars as having met all applicable AAR specifications and requirements and 2. by said committee or under certain appropriate cases, by the ICC as having met all applicable specifications and requirements of Sub-Part I of the Regulations for Transportation of Explosives and Other Dangerous Articles.

"TA" - Tank car equipped w/ container of ICC spec 103A, 103A-W, 103E-W, 103A-N-W, 103C, 103C-W, and 11A100-W-6. Also ARA-II, ARA-III, ICC-103, ICC-103-W or ICC111A100-W-2 if containers and appurtenances were originally designed or reconstructed to comply w/ the requirements of ICC-103A cars.

"TG" - Tank car having one or more glass lined containers of ICC specification 103W-A.

"THI" - Insulated tank car equipped w/ heater device which permits in transit heating of lading. Apparatus powered by other means than through the axle.

"TL" - Tank car equipped w/ container lined w/ any material other than glass, such as ICC spec 103B, 103B-W, 103B100-W, 111A100-W-5, 105A300-W ( rubber lined). Also ARA-III ( rubber lined).

"TM" - Tank car equipped w/ container of ARA or ARR specification I,II,III, III Experimental Welded Seams, IV,203, 203-W, 203-X, or ICC spec 103, 103-W, 103D-W, 104, 104-W, ICC-111A100-W-1, ICC-111A100-W-3 or spec EMERGENCY USG-A, USG-B, USG-C.

"TMU" - Tank car equipped w/ container of ARA spec VI, B, E, Spec 27, ICC Spec 27, 51, 106A500, 106A500-X, 106A800, 106A800-X, 106A88-NCI, , 107A **** series 110A500-W or 100A800-W.

"TP" - Tank car equipped w/ container of ARA Spec IV-A, V or AAR 205A300-W, or ICC Spec 104A, 104A-W, 105, 105A100, 105A100-W, 105A200-W, 105A300, 105A300-W, 105A400, 105A400-W, 105A500, 105A500-W, 105A600, 105A600-W, 109A300-W, 111A100-W-4, 112A400-W or 112A500-W.

"TPA" - Tank car equipped w/ aluminum container of ICC Spec 104A-AL-W, 105A100AL-W, 105A200AL-W, 105A300AL-W, 109A100AL-W, 109A200AL-W or 109A300AL-W.

"TR" - Tank car equipped w/ container of AAR Spec 201A35, 201A35 SPECIAL, 201A35-W, 201A35-X, 201A70-W or ICC Spec 103AL, 103AL-W, 103A-AL-W, 103c-AL and 111A60AL-W.

"TVI" - Tank car equipped w/-insulated container having an inner and outer shell w/ a vacuum in the annular space to AAR Spec 204-W.

"TW" - Tank car equipped w/ one or more wooden containers of ICC Spec 108 or 108A.

Note: Where insulated containers are used in any of the preceding Tank Car Type Classes, the letter "I" should be appended to their applicable designating letters. For example TAI, TGI, etc. The exception would be class THI.

 

I hope this helps. I found it at:

 

http://espee.railfan.net/aar_1967.html

 

Best wishes.

 

Jim Brewer