USDOT 136555 · Interstate · Texas

Southwestern Motor Transport INC

DBA Smt Lines

US DOT136555

MC Docket80252

Operating authorityAuthorized · Common · Contract

Insurance on fileBIPD $1M · Cargo

Safety ratingCheck on SAFER →

OperationInterstate

Census statusActive

ClassificationFor-hire carrier

Power units (fleet)277

Drivers252

LocationSan Antonio, TX 78218

Cargo carriedGeneral Freight, Building materials / construction, Oilfield Equipment, Chemicals, Beverages, Paper Products

MCS-150 mileage14,460,000 mi (2025)

Phone (on file)(210) 661-6791

HazmatYes, hazardous materials

Sources: census record as of October 19, 2026; authority and insurance from FMCSA L&I, checked October 19, 2026; inspections and crashes from FMCSA SMS, checked October 19, 2026.

Quick answer

Southwestern Motor Transport INC is an interstate motor carrier in San Antonio, Texas (USDOT 136555) with active operating authority and a self-reported fleet of 277 power units.

Key takeaways

USDOT 136555 is registered to Southwestern Motor Transport INC, an interstate carrier based in San Antonio, TX.
MC docket number on file: MC-80252.
Operating authority status: authorized (Common, Contract), with $1M BIPD insurance on file.
Self-reported fleet size: 277 power units and 252 drivers (FMCSA MCS-150 self-report; sanitized for plausibility).
Registered cargo types include general freight, building materials / construction, oilfield equipment, chemicals.

Safety & inspections

Official rating on SAFER →

151InspectionsFMCSA roadside, 24 months

16 of 121Vehicle inspections with an out-of-service order13.2%

2 of 151Driver inspections with an out-of-service order1.3%

10Crashes on file0 fatalities · 4 injuries reported

Source: FMCSA Safety Measurement System, roadside inspections and crashes over a ~24-month window, checked October 19, 2026. An out-of-service rate is the share of inspections in which a vehicle or driver was placed out of service. With few inspections, one result moves the rate a lot. FMCSA crash records include crashes regardless of fault. None of these figures is a safety rating. The official Satisfactory/Conditional/Unsatisfactory safety rating is issued separately. See SAFER.

About Southwestern Motor Transport INC

Southwestern Motor Transport INC is an interstate motor carrier based in San Antonio, Texas, registered with the FMCSA under USDOT 136555. It holds active operating authority (MC-80252), with $1M of BIPD insurance on file. The carrier self-reports a fleet of 277 power units and 252 drivers. Registered cargo includes general freight, building materials / construction, oilfield equipment, chemicals, beverages. Its most recent MCS-150 filing reported 14,460,000 mi (2025).

Before you work with this carrier

Confirm the safety rating. Authority and insurance are shown or linked above. Open the SAFER snapshot for the official safety rating and out-of-service status.
Verify insurance is current. Coverage on file can lapse; confirm active BIPD/cargo before tendering a load.
Match authority to the work. For-hire loads need active operating authority. A USDOT number alone isn't enough.

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