Southwestern Motor Transport Inc

4600 Goldfield, San Antonio, Texas 78218 (210) 661-6791

Verified Oct 19, 2026 against FMCSA Company Census File (data.transportation.gov)

Southwestern Motor Transport Inc (USDOT 136555, MC-80252), doing business as Smt Lines, is an active motor carrier based in San Antonio, Texas that FMCSA's census classifies as for-hire and that declares hazardous materials on its MCS-150. Operation: interstate. Operating authority: active for-hire authority (MC). Fleet: 277 power units and 252 drivers (225 with CDLs). Power units count straight trucks as well as tractors, so they can exceed the tractor count. It reported 14,460,000 miles in 2025. Cargo classes declared: chemicals, oilfield equipment, general freight, building materials, construction, beverages, paper products. FMCSA safety rating: satisfactory, from a compliance review on November 5, 2015, 11 years ago; it reflects that review, not current performance. Registration (MCS-150) last updated October 15, 2026.

Key facts

Fleet size	100–499 power units source
FMCSA safety rating	Satisfactory source
Rating age	Rating over 10 years old source
Registration update overdue	No source
Operation	Interstate source
Cargo classes (MCS-150)	Chemicals, Oilfield equipment, General freight, Building materials, Construction, Beverages, Paper products source
Driver count	100–499 drivers source
Last MCS-150 update	Oct 15, 2026 source
Doing business as	Smt Lines source
USDOT number	136555 source
MC docket	MC-80252 source
Operating authority	Active for-hire authority (MC) source
Power units	277 source
Tractors (owned or leased)	230 source
Trailers (owned or leased)	740 source
Drivers	252 source
CDL drivers	225 source
Annual miles (MCS-150)	14,460,000 miles source
Mileage year	2025 source
Also hauls its own freight	No source
Safety rating date	Nov 5, 2015 source
USDOT registered since	Jun 1, 1974 source
Business type	Corporation source

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Browse related lists

USDOT number: The registration number every interstate (and many intrastate) commercial carrier holds.

MCS-150: The registration form carriers file with FMCSA and must update at least every two years; fleet, drivers, cargo and the hazmat flag on this site come from it, as the carrier declared them.

Safety rating: FMCSA's result after an on-site compliance review: Satisfactory, Conditional or Unsatisfactory. A rating is not refreshed unless FMCSA reviews the carrier again, so many are years old; each profile gives the review date. Most carriers have never been reviewed and are not rated; that is not a bad mark.

Power units: Trucks and tractors that pull or carry freight.

Cargo classes: Self-declared on the MCS-150 from FMCSA's fixed list. Some carriers tick most of the list, so a long list means 'declared', not 'specialises in'; the hazmat flag does not say which hazardous materials.

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Something wrong or out of date? Suggest a correction. Source record ID 136555.