• Improved diesel engine 2А-9DG-02
• Microprocessor-based control and diagnostics system
• Per axle regulation of tangential tractive force
• Frame-supported suspension of traction electric motors
• Highly efficient fan of cooling device
• New control panel with improved ergonomic characteristics and display of parameters
• Bogie with components having improved design and traction boosters
• Combined system of coolant temperature automatic control
• Two-stage engine air cleaner
• Wheel flange lubricator
• Locomotive cab conditioner
• Complex safety device KLUB-U
• High-strength electrically heated windscreens and side windows
• Windscreen wiper of pantograph type with electric drive

Freight mainline diesel locomotive 2ТE70 consisting of 2 sections rated 3000 kW each is standardized with passenger diesel locomotives ТEP70BS for main components. Each section is equipped with diesel-generator 2А-9DG-02 including diesel engine 16ChN 26/26 produced by Kolomensky Zavod and traction generator installed on common bed plate. The diesel engine representing a family of D49 engines is 4-cycle, 16-cylinder, V-type turbocharged engine with electronic speed governor and charge air cooling.

The electric a.c.-d.c. transmission with axle control of tractive force (depending on wheel and track adhesion conditions) employed in the locomotive includes traction generator GST2800-1000U2, controlled rectifying unit М-ТPP-3600D and 6 traction d.c. motors EDU – 133R UKHL1.

Locomotive equipment is installed in wagon type body having frame without diagonal brace and welded iron sheathing included in load-bearing structure. Locomotive section has one cab and engine room, the second cab is replaced by tambour where brake compressor and other equipment are arranged. Body roof consists of separate detachable sections. 2 main reservoirs with capacity of 1000 l are installed on tambour roof. The load-bearing scheme of the body frame includes channels of centralized air supply system supplying air for electric machinery. Free access to diesel-generator and other equipment is provided in engine room from both sidewalls of the locomotive body. Fuel tank arranged in the mid portion of the body frame has recesses for storage batteries.

The locomotive cab is equipped with modern ergonomic control panel where color graphic display, information displays of complex safety device KLUB-U and controls are arranged. High-strength windscreens and side windows as well as rear-view mirrors are electrically heated. Windscreen wipers of pantograph type are provided. The locomotive cab has heating and ventilation system as well as air conditioner.

The locomotive body rests on two 3-axle bogies with 2-stage spring suspension and hydraulic shock absorbers in the first and second stage, having spring linkage with the body in horizontal plane. Bogies have separate drive of wheel pairs, frame-supported suspension of traction electric motors, jawless drive axle-boxes. Driving of wheel pairs is through traction gearbox and shallow cardan shaft with hinge and lever couplings, rolling bearings in the seat of driven gear of the traction gearbox. Traction and brake forces are transmitted from the bogie frame to the locomotive body by means of pivot mechanism providing rotation and free vertical movement of the body relative to bogie as well as its loose placement while swaying. The pneumatic traction boosters installed in the locomotive provide improvement of hauling properties by increase of adhesion weight use factor. To reduce wearing of wheels and side surface of rails the locomotive is equipped with patented wheel flange lubricators.

The locomotive brake equipment includes pneumatically controlled friction brakes, electric (rheostat) brake rated 3200 kW, manually operated parking friction brake. The locomotive is equipped with electrically-driven brake compressor PK-5,25А, brake apparatus. To improve reliability of brake equipment a patented air-drying system is employed in the locomotive.

Axial-flow fan included in the centralized air supply system provides air cooling of the locomotive electric equipment. Air intake by the fan is through multicyclone low-maintenance filter which cleans air of dust, moisture and snow. Engine air cleaner is a proprietary double-stage cleaner, with multicyclone in the first stage.

The locomotive cooling device of shaft type is intended for cooling water, oil and charge air. The engine cooling system has 2 circuits. Thermal condition of the diesel engine is maintained by combined coolant temperature automatic control system due to smooth change of cooling fan speed depending on water temperature in the circuit.

Below the shaft of the locomotive cooling device a heating boiler having a pump for pumping water is installed to provide heating of engine coolant (when settling) from external power supply (380 V) or from the second locomotive section. Water cleaning hydraulic cyclones extending maintenance intervals for cooling device sections are also arranged below the shaft.

Engine start is provided by starter-generator 6SGU2 from storage battery 48TN-450TM. Starter-generator is mounted on traction generator and is engine driven. Control circuit voltage is 110 V.

To provide control of tractive force per axle a controlled rectifier is employed. When the locomotive avoids wheel pair slipping the rectifier operates as usual rectifying unit. In case of loss of adhesion by one or several wheel pairs the speed sensors send signals to microprocessor-based system resulting in voltage reduction in corresponding engines and slipping stoppage. Depending on adhesion conditions reduction of tractive force takes place only for certain engines and due to this the locomotive tangential force increases under limited adhesion conditions.

Microprocessor-based control and diagnostics system MSU-TP installed on freight diesel locomotive 2TE70 includes software and hardware and power supply units arranged in a single rack; sensors and measurement transducers; display module and controller mounted on driver’s desk.

Microprocessor-based control and diagnostics system provides locomotive control in the traction and electric braking mode, control of heating boiler and wheel flange lubricator, output of warning and emergency information on the display of the leading locomotive section, control of the leading and secondary section performance, interaction with the safety system KLUB-U and other systems, diagnostics of the main locomotive components and equipment as well as self-diagnostics.

The locomotive is equipped with a radio station, remote control system TSKBM providing control of the driver wakefulness, automatic control device for train stop and automatic fire extinguishing system.