# Thomas Saf-T-Liner

The Thomas Saf-T-Liner is the name of the transit-style (Type D) school bus product line produced by Thomas Built Buses. Introduced in 1978, the Saf-T-Liner marked the transition to in-house chassis production by Thomas. In addition to school bus applications, variations of the Saf-T-Liner have been produced as activity buses, specialty vehicles, and commercial/transit buses. It can also be used to describe the Saf-T-Liner C2 or Saf-T-Liner FS-65, but they are not considered part of the Saf-T-Liner family.
Currently, all versions of the Saf-T-Liner model line are produced in High Point, North Carolina.

## Design history

Prior to its reorganization as Thomas Built Buses in 1972, Thomas Car Works produced both front and rear-engined transit-style school buses to compete with other manufacturers. As was the common practice during the era, production of the chassis was outsourced to another manufacturer. Thomas offered its transit-style buses on a wide variety of chassis in comparison to other manufacturers (changing between Dodge, Ford, GMC, International Harvester, and Volvo). In contrast, Blue Bird, then the largest school bus manufacturer in the United States, manufactured its own chassis (as did West Coast manufacturer Gillig).
In 1978, coinciding with an updated body design necessitated by federal school bus safety regulations, Thomas became a chassis manufacturer with the launch of the Saf-T-Liner EF and ER (EF=Engine Front, ER=Engine Rear). For the first time, the Saf-T-Liner was produced on a Thomas-designed chassis.

## Current models
### Saf-T-Liner HDX2

In July 2024, Thomas Built Buses revamped the model into the Saf-T-Liner HDX2, which takes design cues from the Type C Saf-T-Liner C2, and whose bodies will be produced in the same Archdale, North Carolina plant that produces the C2.

### Saf-T-Liner EFX2

In March 2025, Thomas Built Buses announced the new Saf-T-Liner EFX2 which, like the HDX2, takes design cues from the Saf-T-Liner C2. The bus will also be produced in the same facility as the C2 and HDX2. This marks the full transition of Type-D production to the Saf-T-Liner C2 Facility (now the Saf-T-Liner Facility).

## Discontinued models
### Saf-T-Liner HD/Saf-T-Liner HDX

In 2001, Thomas introduced its current generation of rear-engine bus with the debut of the Thomas Saf-T-Liner HD (Heavy Duty); for 2004, the HD was re-branded as the HDX.
Serving as the replacement for the Saf-T-Liner ER and WestCoastER, the HD/HDX would use much of the same body, with the exception of the drivers' compartment forward. On the outside, the front roofcap was completely redesigned, fairing in the front warning lights; the "School Bus" lettering was changed to a reflective decal. In a move to increase visibility, the windshield was enlarged and reconfigured to a 2-piece curved configuration. A distinguishing feature of the redesign would be the design of the sideview mirrors. To improve forward sightlines, all three sets of sideview mirrors (flat, convex, and blind-spot crossview) were integrated into single roof-mounted units, eliminating a number of brackets.
Several parts of the redesign reflected the acquisition of Thomas by Freightliner. While the chassis remained a Thomas-produced unit, parts of the body were sourced from Freightliner, including the headlights (from the Century Class) and instrument panel (from the Business Class M2 and Sterling trucks). In a further move to improve visibility, the instrument panel was centrally-mounted. Other changes were intended for the HD/HDX to accommodate a wide variety of bus drivers. The HD/HDX includes a fully adjustable driver's seat, a tilt/telescoping steering column, and an optional adjustable pedal cluster.

### Saf-T-Liner EF

Introduced in 1978, this model underwent minor redesigns during the 1980s that reduced its chrome trim. In 1984, it received rectangular headlights. However, as lower-cost front-engine transits came onto the market in the late 1980s and early 1990s, this model was gradually replaced by the All Star EF and the Saf-T-Liner MVP EF. Today, the Saf-T-Liner EF name lives on as the MVP-series EF lost its prefix in 2007.

### Saf-T-Liner MVP

Standing for Maneuverability, Visibility, and Protection, the MVP series of the Saf-T-Liner represented their first substantial update. Introduced as new series "All-Star" for 1991, the MVP represented Thomas's entry into lower-cost Type D school buses, a segment created by the Blue Bird TC/2000 and Wayne Lifestar, originally based on Oshkosh chassis. It switched to began using the company's chassis for 1995. From the outside, the MVP EF and ER had much larger windshields, and updated drivers compartments. To distinguish them from the Saf-T-Liner ER, the MVP series had dual headlights instead of quad headlights. In 2004, the MVP ER was discontinued as Thomas replaced it and the Saf-T-Liner HD with the HDX. The MVP EF, with minor updates in 2007 and 2010, was produced until it was replaced by the EFX in 2011.

### Saf-T-Liner ER

Introduced in 1978, the ER was produced through the 1980s with relatively few detail changes. In 1984, the headlights and front turn signals were switched from round to rectangular units. In 1991, the driver's compartment was redesigned, with a much larger windshield. During the late 1990s, this model was distinguished from MVP-series ERs by its optional black plastic headlight trim.

#### WestCoastER

Shortly after the introduction of the Saf-T-Liner ER, this variant was introduced by Thomas for West Coast markets (primarily California and Washington State). To better compete with the Crown Supercoaches and Gillig Transit Coaches that had long dominated West Coast school bus sales, Thomas upgraded the Saf-T-Liner ER with heavier-duty components; this upgrade was not made to the EF. Additionally, on 90-passenger models, a second rear axle was an option. As it was a regionally focused model, the WestCoastER did not sell in large numbers. However, as Crown Coach and Gillig both exited the school bus industry in the early 1990s, Thomas gained significant ground on the West Coast.

## Current model specifications

Both current models of the Saf-T-Liner are available with diesel engines (or optional natural gas engine in the HDX2), and have a maximum seating capacity of 90 passengers.
| Model Name | Saf-T-Liner EFX | Saf-T-Liner HDX2 |
| Seating Capacity | to 90 | to 90 |
| Overall Length (inches) | | |
| Body Width (exterior) | 96 inches (2.4 m) | 96 inches (2.4 m) |
| Wheelbase | 136–231 inches (3.5–5.9 m) | 189–273 inches (4.8–6.9 m) |
| Interior Headroom | 78 inches (2.0 m) | 78 inches (2.0 m) |
| GVWR | Up to 36,200 pounds (16,400 kg) | Up to 36,200 pounds (16,400 kg) |
| Fuel Type(s) | Diesel | Diesel Compressed Natural Gas (CNG) |
| Engine | Cummins ISB 6.7 (Discontinued in 2017) (220–300 hp or 160–220 kW) Cummins B6.7 (220–300 hp or 160–220 kW) | Cummins ISB 6.7 (Discontinued in 2017) (220–300 hp or 160–220 kW) Cummins B6.7 (220–300 hp or 160–220 kW) Cummins ISC (discontinued) (260–300 hp or 190–220 kW) Cummins L9N (250--280 hp or 186--208 Cummins ISL-G CNG (250–280 hp or 190–210 kW) Cummins L9 (diesel/CNG) (260–300 hp or 190–220 kW) Detroit Diesel DD8 (2018–present) (260–300 hp or 190–220 kW) Mercedes-Benz MBE926(discontinued 2010) (250 hp or 190 kW) |

## Discontinued model specifications

The discontinued models of the Saf-T-Liner were available with diesel engines (or optional natural gas engine in the ER), and have a maximum seating capacity of 90 passengers.
| Model Name | Saf-T-Liner EF/MVP EF | Saf-T-Liner ER/MVP ER/Westcoast-ER |
| Seating Capacity | to 90 | to 90 |
| Overall Length (inches) | | |
| Body Width (exterior) | Unknown | Unknown |
| Wheelbase | 136–231 inches (3.5–5.9 m) | 189–273 inches (4.8–6.9 m) |
| Interior Headroom | Unknown | Unknown |
| GVWR | Unknown | Unknown |
| Fuel Type(s) | Diesel | Gasoline Diesel Compressed Natural Gas (CNG) |
| Engine | Cummins ISB (200–260 hp or 150–190 kW) Caterpillar C7 (200–260 hp or 150–190 kW) | Cummins 5.9L ISB (diesel/natural gas 1997-2002) (220–300 hp or 160–220 kW) Cummins 8.3L ISC (diesel) (260–300 hp or 190–220 kW) Detroit Diesel 6-71/6L71/6N71 (1982-1991) (260–300 hp or 190–220 kW) Detroit Diesel 6V92 (1982-1995) (260–300 hp or 190–220 kW) 8.1L John Deere I6 (natural gas) (1997-2002) (250–280 hp or 190–210 kW) Cummins VT555 V8 (diesel) (1982-1989) (260–300 hp or 190–220 kW) Caterpillar 3126/C7 (diesel) (260–300 hp or 190–220 kW) Caterpillar 3116 (diesel) (260–300 hp or 190–220 kW) Caterpillar 3208 V8 (diesel) (1982-1995) (260–300 hp or 190–220 kW) |

## Commercial use

Alongside the Saf-T-Liner C2, the EFX and HDX are also produced for commercial applications; Thomas uses the Transit Liner name for its commercial model lines. The replacements for the TL960 and Transit Liner MVP, the Transit Liner EFX/HDX share much of their bodies with the Saf-T-Liner, differing in their windows and seating.