The fourth Era has 7 cargo engines named after ancient gods & heroes, with one being a bonus engine.
You can open new engines by using research points generated by the Laboratory building within your Train Station. Only when you've researched the required pre-requisites, can you begin to develop the next engine. At the end of each era, a coupling system is available, allowing engines to transport goods from the next era.
If you want to compare all the engines, have a look at our Cargo Engine Comparison article.
Note: No passenger engines are available to research on the American Dream scenario.
Research Cost: 45 Research Points
Starting Stats:
• Cost: $500,000 • Tractive force: 6 • Reliability: 30%
• Acceleration: 01 /20 • Max. Speed: 75 km/h
You can research & buy these upgrades:
| Upgrade | Research Points | Upgrade Cost |
| +20% Reliability | 11 | $80,000 |
| +1 Tractive force I | 12 | $100,000 |
| +1 Tractive force II | 10 | $75,000 |
| +1 Acceleration | 16 | $125,000 |
| + 5 km/h Max. speed I | 7 | $50,000 |
| + 10 km/h Max. speed II | 12 | $90,000 |
• The Tractive force & Reliability upgrades lead to the next Passenger Train: The Hermes
• The Acceleration & Max. speed upgrades lead to the next Cargo Train: The Neptune
Research Cost: 30 Research Points
Starting Stats:
• Cost: $300,000 • Tractive force: 4 • Reliability: 75%
• Acceleration: 05 /20 • Max. Speed: 125 km/h
You can research & buy these upgrades:
| Upgrade | Research Points | Upgrade Cost |
| +10% Reliability I | 7 | $50,000 |
| +10% Reliability II | 7 | $50,000 |
| +3 Acceleration | 6 | $35,000 |
| +1 Tractive force | 15 | $120,000 |
| + 20 km/h Max. speed | 16 | $110,000 |
• The Max. speed & Reliability upgrades lead to the next Cargo Train: The Neptune
• The Acceleration & Tractive Force upgrades lead to the next Cargo Train: The Horus
Requirements:
• Research the Ares
• Research its Acceleration & Tractive Force upgrades
Research Cost: 40 Research Points
Starting Stats:
• Cost: $600,000 • Tractive force: 5 • Reliability: 50%
• Acceleration: 15 /20 • Max. Speed: 90 km/h
You can research & buy these upgrades:
| Upgrade | Research Points | Upgrade Cost |
| +20% Reliability | 12 | $75,000 |
| +1 Tractive force I | 15 | $110,000 |
| +1 Tractive force II | 13 | $100,000 |
| +3 Acceleration I | 4 | $20,000 |
| +2 Acceleration II | 2 | $10,000 |
| + 15 km/h Max. speed | 13 | $90,000 |
• The Reliability, Max. speed & Tractive force upgrades lead to the next Passenger Train: The Hypnos
• American Dream Scenario only: its Reliability, Max. speed & upgrades lead to the next Cargo Train: The Thor
Requirements:
• Research the Apollo or Ares & their required upgrades
Research Cost: 55 Research Points
Starting Stats:
• Cost: $600,000 • Tractive force: 7 • Reliability: 40%
• Acceleration: 01 /20 • Max. Speed: 220 km/h
You can research & buy these upgrades:
| Upgrade | Research Points | Upgrade Cost |
| + 10% Reliability I | 7 | $40,000 |
| + 20% Reliability II | 10 | $60,000 |
| + 1 Tractive force | 13 | $100,000 |
| + 1 Acceleration | 18 | $150,000 |
| + 30 km/h Max. speed I | 12 | $100,000 |
| + 10 km/h Max. speed II | 5 | $35,000 |
• The Max. speed I & Reliability upgrades lead to the next Passenger Train: The Hypnos
• The Acceleration & Tractive Force upgrades lead to the next Cargo Train: The Thor
Requirements:
• Research the Hermes or Neptune & their required upgrades
on American Dream Scenario only
• Research the Horus & its Reliability, Max. speed & upgrades
Research Cost: 60Research Points
Starting Stats:
• Cost: $750,000 • Tractive force: 4 • Reliability: 35%
• Acceleration: 07 /20 • Max. Speed: 150 km/h
You can research & buy these upgrades:
| Upgrade | Research Points | Upgrade Cost |
| +15% Reliability I | 12 | $100,000 |
| +10% Reliability II | 8 | $60,000 |
| +2 Tractive force | 30 | $250,000 |
| +2 Acceleration I | 3 | $20,000 |
| +5 Acceleration II | 4 | $30,000 |
| + 25 km/h Max. speed I | 16 | $150,000 |
| + 15 km/h Max. speed II | 9 | $90,000 |
• The Tractive Force & Max. speed upgrades lead to the next Cargo Train: The Poseidon
Requirements:
• Research the Thor or the Hypnos & their required upgrades
Research Cost: 65 Research Points
Starting Stats:
• Cost: $2,000,000 • Tractive force: 15 • Reliability: 60%
• Acceleration: 06 /20 • Max. Speed: 140 km/h
The Poseidon is a multi-slot engine and takes 3 slots instead of only one.
You can research & buy these upgrades:
| Upgrade | Research Points | Upgrade Cost |
| +10% Reliability I | 8 | $100,000 |
| +10% Reliability II | 8 | $100,000 |
| +1 Tractive Force I | 7 | $110,000 |
| +3 Tractive Force II | 19 | $300,000 |
| +2 Acceleration I | 7 | $80,000 |
| +2 Acceleration II | 5 | $50,000 |
| + 20 km/h Max. speed I | 15 | $220,000 |
| + 10 km/h Max. speed II | 11 | $150,000 |
• This is the last Train of Era 4. You need to research it and all of its upgrades to be able to research The Coupling for 70 Research Points
The Zeus is the Cargo Bonus Engine of Era 4. It can be bought in
the Rail Nation Shop and can be won through the Lottery or by
entering competitions in Era 5.
Starting Stats:
• Cost: 2,500 Gold • Tractive force: 7 • Reliability: 80%
• Acceleration: 07 /20 • Max. Speed: 150 km/h
Note: The cost of the bonus train reduces if purchased in a later era.
The Passenger and Cargo bonus engines for an era can also be purchased as a bundle from the Rail Nation Shop.
You can install these upgrades:
| Upgrade | Upgrade Cost |
| +10% Reliability | 100 Gold |
| +1 Tractive Force | 100 Gold |
| +5 Acceleration | 100 Gold |
| + 20 km/h Max. speed | 100 Gold |