Southwestern Motor Transport Inc
USDOT 136555 · MC-825355, MC-825355 · San Antonio, Texas · Interstate for-hire carrier · 250–499 power units
Southwestern Motor Transport Inc (dba SMT Lines) is a corporation based in San Antonio, Texas, registered with the FMCSA as an interstate carrier (authorized for hire). It reports 277 power units and 252 drivers, which ranks it #124 by fleet size among 910 active for-hire carriers with 50+ power units headquartered in Texas. In the 24 months to Sep 24, 2026 its trucks were inspected 151 times – about 0.5 inspections per power unit. 13.2% of vehicle inspections and 1.3% of driver inspections ended with an out-of-service order, against 18.3% and 2.0% for carriers of the same size nationally. FMCSA records 9 reportable crashes in the last 24 months (4 injuries, 0 fatalities, 8 tow-away), or 3.2 per 100 power units versus 4.2 for its size band. Crash counts in FMCSA data do not indicate fault. Its registered cargo types are general freight, building materials, oilfield equipment, chemicals, beverages, paper products, construction.
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Registration and contact
| Legal name | Southwestern Motor Transport Inc |
|---|---|
| DBA name | SMT Lines |
| USDOT number | 136555 |
| Operating authority (docket) | MC-825355, MC-825355 |
| Entity type | Authorized for Hire |
| Operation | Interstate |
| Business type | Corporation |
| Physical address | 4600 Goldfield, San Antonio, TX 78218 |
| Phone | (210) 661-6791 |
| First registered | Jun 1, 1974 |
| Last MCS-150 update | Oct 15, 2026 |
| Hazmat carrier | Yes |
Check live authority, insurance and out-of-service status: FMCSA SAFER snapshot for USDOT 136555.
Fleet and drivers
| Equipment | Owned | Term-leased | Trip-leased |
|---|---|---|---|
| Straight trucks | 37 | 10 | 0 |
| Truck tractors | 182 | 48 | 0 |
| Trailers | 740 | 0 | 0 |
- 0.91 drivers per power unit (national median for 50+ unit fleets: 0.99).
- 3.2 trailers per tractor – a drop-and-hook style trailer pool.
- 14,460,000 miles reported for 2025 – about 52,202 miles per power unit vs a 41,335 median for 250–499-unit fleets.
- 94% of listed equipment is owned rather than leased.
- 225 CDL drivers; 66 drivers operate interstate beyond 100 miles, 186 within 100 miles.
Safety record
Roadside inspections Sep 25, 2024 – Sep 24, 2026; crashes Nov 1, 2024 – Oct 31, 2026. Benchmarks: 250–499-unit for-hire carriers nationally (792) and Texas carriers with 50+ units (910).
| Measure | Southwestern Motor Transport | Same size, US | TX average | |
|---|---|---|---|---|
| Vehicle out-of-service rate | 13.2% | 18.3% | 18.6% | 28% lower than average |
| Driver out-of-service rate | 1.3% | 2.0% | 3.5% | 34% lower than average |
| Crashes per 100 power units | 3.2 | 4.2 | 3.9 | 22% lower than average |
| Inspections | 151 | 151 with a driver check, 121 with a vehicle check, 100 BASIC violations recorded, 16 hazmat-related | ||
| FMCSA safety rating | Satisfactory (rated Nov 5, 2015) | |||
Cargo carried
Less common in this directory: oilfield equipment (522 of 5,000 carriers).
Similar carriers in Texas
Closest fleet size and cargo mix among Texas carriers in this directory.
| Carrier | City | Power units | Drivers | Inspections (24 mo) | Vehicle OOS | Crashes (24 mo) |
|---|---|---|---|---|---|---|
| Terrier Transportation Inc USDOT 694249 | Houston | 237 | 94 | 206 | 22.1% | 7 |
| Incompass Logistics LLC USDOT 2631140 | The Woodlands | 237 | 61 | 30 | 28.0% | 3 |
| Expedited Logistics and Freight Services LLC USDOT 1240099 | Houston | 244 | 244 | 137 | 21.7% | 5 |
| Streamtech Inc USDOT 448601 | Houston | 265 | 235 | 26 | 31.8% | 1 |
| Jax Transport LLC USDOT 1876810 | Amarillo | 221 | 196 | 721 | 14.7% | 19 |
| Tri Star Freight System Inc USDOT 325836 | Houston | 282 | 140 | 266 | 33.3% | 7 |
Other carriers near San Antonio
| Carrier | City | Power units | Drivers | Inspections (24 mo) | Vehicle OOS | Crashes (24 mo) |
|---|---|---|---|---|---|---|
| H-E-B LP USDOT 351057 | San Antonio | 922 | 1,407 | 847 | 2.6% | 58 |
| Holt Texas Ltd USDOT 542319 | San Antonio | 739 | 630 | 103 | 8.6% | 11 |
| Coastal Transport Company Inc USDOT 36647 | San Antonio | 715 | 330 | 607 | 7.1% | 23 |
| Unique Leasing Inc USDOT 363676 | San Antonio | 208 | 202 | 167 | 13.2% | 12 |
| Detmar Transport LLC USDOT 3638442 | San Antonio | 196 | 191 | 126 | 21.1% | 16 |
| Step Energy Services USA Ltd USDOT 2640421 | San Antonio | 193 | 165 | 27 | 36.8% | 1 |
| VTS Transportation Inc USDOT 1930689 | San Antonio | 180 | 185 | 592 | 17.1% | 16 |
| Alamo Transit Company USDOT 1941898 | San Antonio | 172 | 172 | 315 | 24.2% | 15 |
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FAQ
What is the USDOT number of Southwestern Motor Transport Inc?
Southwestern Motor Transport Inc is registered with USDOT number 136555 and operating authority MC-825355, MC-825355.
How many trucks does Southwestern Motor Transport Inc have?
It reports 277 power units (230 tractors, 47 straight trucks) and 740 trailers, with 252 drivers, on its last MCS-150 update (Oct 15, 2026).
Where is Southwestern Motor Transport Inc located?
Its registered physical address is in San Antonio, Texas 78218.
What is the out-of-service rate of Southwestern Motor Transport Inc?
Over 24 months, 13.2% of vehicle inspections and 1.3% of driver inspections resulted in an out-of-service order (same-size national average: 18.3% vehicle, 2.0% driver).
Source: FMCSA Company Census File, SMS inspection file and Crash File (data.transportation.gov), refreshed 2026-11-04. Figures are as reported to FMCSA and may lag. How we calculate these numbers. Spotted an error? Carriers update their record with FMCSA via the MCS-150 form; see corrections.