Train tractor from 9 letters: what is it, types of locomotives and their technical characteristics

When it comes to 9 letter train tractor, most people immediately think of the locomotive - the heart of railway transport. But why exactly 9 letters? This question often arises among fans of crossword puzzles, scanword puzzles, or simply curious people interested in technology. In fact, the correct answer is "locomotive", and in this article we will analyze not only the linguistic background, but also the technical aspects: from the device to the operation of different types of tractors.

Trains cannot move on their own - they need a source of energy and force to pull the train along the rails. Depending on the type of energy (steam, electricity, diesel), locomotives are divided into several categories, each of which has its own advantages and scope. For example, electric locomotives indispensable in electrified areas, and diesel locomotives - where there is no contact network. But how to choose the right “tractor” for specific tasks? And why in some cases are two locomotives used at once? The answers are below.

By the way, if you are here because of the scanword, we’ll give you a hint right away: the 9-letter word for a train tractor starts with “L” and ends with “V”. But for those who want to understand deeper, we have prepared a complete guide to locomotives - from history to modern innovations.

What is a locomotive and why is it called a “tractor”?

Term "locomotive" comes from Latin words loco (“from the spot”) and motivus (“sets in motion”). This is a vehicle designed to move along rails and move attached cars. People often call it tractor - because the main function of the locomotive is to overcoming resistance composition and ensuring its movement.

Locomotives are classified according to several criteria:

• 🔋 Energy Type: steam, diesel, electric, gas turbine.
• 🚂 Purpose: cargo, passenger, shunting, industrial.
• 📏 Axial formula: number of driving and supporting axes (for example, 2O-2O-2O for electric locomotive VL80).

It is interesting that in some countries (for example, in the USA) instead of the word “locomotive” the term is often used engine (“engine”), which also reflects its main function. In Russia, it was the word that took root "locomotive", which is the answer to the question about 9 letters.

But why exactly 9 letters? The fact is that in Russian this word is written together and consists of four syllables: lo-co-mo-tiv. Alternative options, such as “diesel locomotive” (8 letters) or “electric locomotive” (9 letters, but starts with “E”), do not fit the requirements of the scanword if we are talking about a general concept.

Types of locomotives: from steam locomotives to modern hybrids

The evolution of locomotives goes back more than two centuries. First steam locomotives, invented at the beginning of the 19th century, worked on coal and water, converting thermal energy into mechanical energy. Today they have become museum exhibits, but in some tourist routes (for example, on Trans-Baikal Railway) are still used in retro trains.

From the middle of the 20th century, steam locomotives began to be replaced by more efficient types:

• ⚡ Electric locomotives: They are powered by a contact network, are environmentally friendly, but require infrastructure (power lines, substations). Examples: VL10, EP20.
• ⛽ Diesel locomotives: They run on diesel fuel, are autonomous, but less powerful. Popular models: TEP70, 2TE116.
• ⚙️ Gas turbine locomotives: experimental, use gas turbines (for example, GT1 in the USSR).
• ♻️ Hybrids: combine a diesel generator and electric traction (for example, TEM9 for shunting work).

In the last decade, they have been gaining popularity battery locomotives and hydrogen fuel cell models. For example, trains are already being tested in Germany Coradia iLint, which do not emit CO₂, and are developing a project in Russia "Sibiryak" with a hybrid power plant.

An important fact: in Russia, by 2030, it is planned to completely abandon diesel locomotives on main routes in favor of electric locomotives and hybrids - this is part of the transport decarbonization strategy.

The structure of a locomotive: how does it work from the inside?

Regardless of the type, any locomotive consists of several key components:

1. Body — a supporting structure that protects the equipment.
2. Powerplant — engine (diesel, electric motor, turbine).
3. Traction drive — transmits torque to the wheels.
4. Control cabin — driver’s workplace with instruments.
5. Brake system - pneumatic or electric.

Let's take a closer look electric locomotive using the model as an example EP2D. His heart is traction motors, which receive power from the contact network through pantograph. The voltage (typically 3 kV or 25 kV) is converted to traction converters, and then fed to the engines that rotate the wheelsets. For smooth acceleration the system is used rheostatic or pulse control.

B diesel locomotives The energy of a diesel engine is converted into electrical energy using generator, which powers the traction electric motors. For example, in TEP70 diesel installed 2A-5D49 with a power of 3000 hp, and energy is transmitted through AC-DC current.

How is a locomotive chosen for a specific route?

The choice of “tractor” depends on many factors:

• 📍 Path profile: in mountain areas locomotives with high traction force (for example, VL85 for the Ural passes).
• ⚡ Electrification: if there is no contact network, diesel locomotives or hybrids are used.
• 🚆 Composition type: passenger trains require smooth running (e.g. EP20 for Sapsan), and cargo ones - high power.
• ☁️ Climate: in the conditions of the Far North, locomotives are equipped arctic packages (insulation, special lubricants).

For example, for fast passenger trains optimal on electrified lines EP2D or ChS7, and for heavy freight trains (weighing up to 9 thousand tons) - twin diesel locomotives 2TE25A.

⚠️ Attention: Using an unsuitable locomotive may result in engine overheating (for example, if a diesel locomotive is pulling a train on a steep incline without additional assistance) or damage to the contact network (if the electric locomotive is too powerful for this section).

Top 5 most powerful locomotives in the world

If we talk about records, modern locomotives are capable of pulling trains weighing tens of thousands of tons. Here are the top five in terms of power and load capacity:

1. Big Boy (USA, 1941) - axial locomotive 4-8-8-4, developed power 6290 hp (used to transport coal across the Rocky Mountains).
2. TEP80 (USSR, 1988) - diesel locomotive for high-speed trains, set a speed record 271 km/h (still not beaten for diesel traction).
3. IORE (Sweden, 2000) - an electric locomotive for ore trains, pulls trains weighing up to 8600 tons.
4. AC6000CW (USA, 1995) - diesel locomotive from GE Transportation, power 6000 hp, used in Canada to transport oil.
5. 2ES10 "Granite" (Russia, 2010) - AC electric locomotive, capable of driving freight trains weighing up to 7100 tons.

Interestingly, the record holder for train length was installed in Australia in 2001: a train of 682 cars with a total length 7.35 km pulled 8 locomotives General Electric Dash 9.