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Freight Car Detail Parts

1010 Common Standard Roping Staple

OMM 1010 Common Standard Roping StaplePhoto of Four OMM #1010s still on brass sprue on the tip of my finger!

Common Standard Roping Staple was used on most late-Harriman era (starting around 1905-1911) frieght cars on both the SP and UP systems and subsidaries well into the 1920s. The Roping Staple was fixed to the side sill of the car, above the bolster, to provide a secure point to attach ropes, chains, or cables to move the car without use of a locomotive, such as a winch.

Currently OMM is offering this part as a detail part for Red Caboose S-40-Series Stock Cars.

OMM 1010 $4.95/4-pkg

2" Frangible Tank Car Vents

OMM 1004 2in Frangible Top-Mount VentPhoto of OMM #1004 2" Frangible Top-Mount Vent on P2K 8K Gal tankcar.

OwlMtModels is proud to release this new run of 2" Frangible Safety Vents. These vents were used on tankcars, especially insulated cars in wine-stock service, which must not be contaminated with foreign materials and carried goods that did not have very much thermal expansion. "Style-A" Vents have a frangible plate sandwiched below the vent casting head that would fail or rupture at 25 PSI, allowing the tank to vent off extra pressure. The "Style-B" Vents do not have this frangible plate and were open to the outside enviroment. However unlike the 5" vents (OMM 1001 & 1002), the Style-B Vents have the covering head cap to prevent debris from landing on the vent seal and falling into the tank when the vent lifts.

Early multi-dome wine cars, from the 1920s, mostly had L-Mount styles, but photographs show the last few years of wine car construction during the mid to late 1930s used the Top-Mount type. It would seem to relate to the other tankcar vents changing around 1920, why did they wait 10 years to change? The reason for this change is not known.

Some installations of these vents had safety chains connecting the vent head cap with the dome of the car or lower on the 2" pipe manifold, because when the franible disk failed it was possible that the force of the escaping air would lift and carry the head casing away.

OwlMtModels is also offering the A-Style in both "Top Mount" and side "L-Mount" versions.

1003 AL

A-Style Frangible Disk 2" L-Mount Vent. $4.95/each

OwlMtModels Special rates for 4 and 6 unit packages available with the drop down menu above.

1004 AT

Style-A Frangible Disk 2" Top-Mount Vent. $4.95/each

OwlMtModels Special rates for 4 and 6 unit packages available with the drop down menu above.

1005 BL

Style-B Non-Frangible Disk 2" L-Mount Vent. Top-Mount version can be made by cutting off the L-shaped manifold just above the elbow fitting and mounting in drilled hole in top of dome. $4.95/each

OwlMtModels Special rates for 4 and 6 packages available with the drop down menu above.

5" M.C.B. Tank Car Vents

1001 Single L-mount

OMM 1001 on tankcarPhoto of OMM#1001 on MDC old-time tankcar.

This 5" vent model replicates the Master Car Builders design from 1904. A standard single "L-shaped" manifold 5" safety vent was used on tankcars up to 8,000 US Gal. For cars above 8,000 US Gal., "twin vents" (see OMM #1002 part below) were used, or a pair of single vents were installed on opposite sides of the dome. The single vents had an L-shaped manifold connecting the vent to the expansion dome of the tankcar part way up. They were used on all general service tankcars until about 1918 when the standard recommended design was changed to mounting the same 5" vent head on a flange in the top of the dome. Top-mounting prevented the L-shape manifold from being submerged in the commodity carried in the car and expelling the commodity instead of air. Cars built and rebuilt after about 1918 were fitted with the top vent style.

Often seen on SP class O-50-1, -2, & -5s 12.5k Gal tankcars.

OMM #1001 $4.95/each
"Single L-Vent"
OwlMtModels Special rates for 6 unit package available with the drop down menu above.

1002 "Twin" L-mount

OMM 1002 Twin 5 inch ventPhoto from Peter Hall of his O-50-8 kitbash using OMM#1002.

This vent model represents the Master Car Biulders design from 1904 for a double (or "twin") "L-shaped" manifold 5" safety vent for tankcars over 8,000 US Gal. These vents were commonly seen on 8K, 10K, and 12.5K tankcars in general service. The distinctive manifold is easily picked out in photos. These vents had an L-shaped manifold connecting the vent to the expansion dome of the tankcar part way up. They were used on all general service tankcars until about 1918 when the standard recommended design was changed to mounting the same 5" vent head on a flange in the top of the dome. This prevented the L-shape manifold from expelling the commodity out of the vent instead of air. Cars built and rebuilt after about 1918 were fitted with the top vent style.

Often seen on SP class O-50-6, -7, -8, & -9s 12.5k Gal. tankcars.

OMM #1002 $4.95/each
"Twin L-Vent"
OwlMtModels Special rates for 5 unit package available with the drop down menu above.

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