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Era 4 has 6 engines and a bonus engine.

Engines here are set between 1940-1960.

Research, Era 4

Era 4 Research Tree

Usually the Poseidon is the engine to aim for in era 4.

There are two different paths to the Thor:

  • Neptune (A): 56 pts.
  • Horus (B): 137 pts.

Apollo

Main article: Apollo
MOIRA
The Apollo
Era 4
DE: Apollon; PT: Moira
Tractive Force: 8 (max: 9)
Upgrade: Pressure intensifier: +1, $100,000, 15 RP
Reliability: 50% (max: 70%)
Upgrade: Hydraulic buffer: +20%, $55,000, 7 RP
Acceleration: 4/20 (max: 6/20)
Upgrade: Load shock absorber: +2, $50,000, 8 RP
Speed: 75 km/h (max: 100 km/h)
Upgrade: Structure amplifier: +15 km/h, $65,000, 9 RP
Upgrade: Flange oilers: +10 km/h, $50,000, 7 RP

Purchase Cost: $500,000 (max: $820,000)
Research Cost: 40 RP (max: 86 RP)
Prerequisites: none
Sell price: $220,000

Ares

Main article: Ares
ARES
The Ares
Era 4
DE: Ares; PT: Ares
Tractive Force: 5 (max: 6)
Upgrade: Steam ringing-apparatus: +1, $150,000, 20 RP
Reliability: 70% (max: 90%)
Upgrade: Friction shock absorber: +20%, $65,000, 8 RP
Acceleration: 15/20 (max: 19/20)
Upgrade: Central lubrication: +4, $30,000, 6 RP
Speed: 135 km/h (max: 160 km/h)
Upgrade: 5KW alternator: +25 km/h, $100,000, 16 RP

Purchase Cost: $600,000 (max: $945,000)
Research Cost: 45 RP (max: 95 RP)
Prerequisites: Apollo + Pressure intensifier + Flange oilers
Sell price: $264,000

Neptune

Main article: Neptune
Neptune
The Neptune
Era 4
DE: Neptun; PT: Mondego
Tractive Force: 7 (max: 8)
Upgrade: Davis coupling: +1, $100,000, 15 RP
Reliability: 30% (max: 80%)
Upgrade: Truman wheel: +30%, $60,000, 10 RP
Upgrade: Control shaft: +20%, $40,000, 6 RP
Acceleration: 7/20 (max: 11/20)
Upgrade: V-12: +3, $50,000, 7 RP
Upgrade: Refrigerating compressor: +1, $20,000, 3 RP
Speed: 90 km/h (max: 120 km/h)
Upgrade: Core bearing: +30 km/h, $150,000, 18 RP

Appr. service cost at 70%: $51,000
Purchase Cost: $300,000 (max: $720,000)
Research Cost: 25 RP (max: 84 RP)
Prerequisites: Ares + Central lubrication
Sell price: $132,000

Horus

Main article: Horus
JOANINHA
The Horus
Era 4
DE: Horus; PT: Joaninha
Tractive Force: 9 (max: 10)
Upgrade: Hobble rails: +1, $120,000, 16 RP
Reliability: 50% (max: 70%)
Upgrade: Golom basin: +10%, $30,000, 5 RP
Upgrade: Double spokes: +10%, $30,000, 5 RP
Acceleration: 3/20 (max: 4/20)
Upgrade: Traction motor: +1, $40,000, 6 RP
Speed: 100 km/h (max: 110 km/h)
Upgrade: Steam ringing-apparatus: +10 km/h, $60,000, 7 RP

Purchase Cost: $750,000 (max: $1,030,000)
Research Cost: 60 RP (max: 99 RP)
Prerequisites: Ares + Steam ringing-apparatus + 5KW alternator + Friction shock absorber
Sell price: $330,000

Thor

Main article: Thor
TROVÃO
The Thor
Era 4
DE: Thor; PT: Trovão
Tractive Force: 6 (max: 8)
Upgrade: Ward connector: +1, $150,000, 20 RP
Upgrade: Hydraulics mounting: +1, $150,000, 18 RP
Reliability: 40% (max: 75%)
Upgrade: Standard link: +10%, $30,000, 6 RP
Upgrade: Improved insulation: +25%, $55,000, 13 RP
Acceleration: 5/20 (max: 15/20)
Upgrade: Inverter: +6, $100,000, 12 RP
Upgrade: Hydro transmission: +4, $65,000, 7 RP
Speed: 110 km/h (max: 150 km/h)
Upgrade: Vibration dampener: +30 km/h, $125,000, 15 RP
Upgrade: HTC truck: +10 km/h, $80,000, 7 RP

Purchase Cost: $600,000 (max: $1,355,000)
Research Cost: 40 RP (max: 138 RP)
Prerequisites: Neptune + Refrigerating compressor + Davis coupling
OR
Horus + Central lubrication
Sell price: $264,000

Poseidon

Main article: Poseidon
Poseidon
The Poseidon
Era 4
DE: Poseidon; PT: Flecha
Tractive Force: 18 (max: 22)
Upgrade: Transmission housing: +4, $500,000, 25 RP
Reliability: 60% (max: 80%)
Upgrade: Sound reduction: +20%, $200,000, 13 RP
Acceleration: 5/20 (max: 12/20)
Upgrade: Engine: +4, $175,000, 14 RP
Upgrade: Traction motor: +3, $150,000, 8 RP
Speed: 180 km/h (max: 220 km/h)
Upgrade: Alternator: +20 km/h, $250,000, 16 RP
Upgrade: Shaw bumper: +20 km/h, $300,000, 20 RP

Purchase Cost: $2,000,000 (max: $3,575,000)
Research Cost: 50 RP (max: 146 RP)
Spaces taken in EH: 3
Prerequisites: Thor + Hydraulics mounting + Hydro transmission + HTC truck + Improved insulation
Sell price: $880,000

Zeus (bonus engine)

Main article: Zeus
The Zeus
Era 4
PT: Zéfirus
Tractive Force: 9 (max: 9)
Reliability: 80% (max: 80%)
Acceleration: 9/20 (max: 9/20)
Speed: 150 km/h (max: 150 km/h)

Purchase Cost: $0 (max: $0)
Research Cost: 0 RP (max: 0 RP)
Prerequisites: bonus

Era 5 - Coupling

The Era 4 engines can carry Era 5 goods with use of the Trumpet coupling, costing 80 research pts., and requiring a fully researched Poseidon. The minimal complete cost of coupling is 536 RP.

Comparison of Engine Performance

Engine Reliability Acceleration (/20) WSP Speed km/h Tractive Force Slots Reliability* WSP* Speed km/h*
Apollo 70% 6 900 100 9 1 95% 855 95
Ares 90% 19 960 160 6 1 98.33% 944 157
Neptune 80% 11 960 120 8 1 96.67% 928 116
Horus 70% 4 1100 110 10 1 95% 1045 105
Thor 75% 15 1200 150 8 1 95.83% 1150 144
Poseidon 80% 12 1613.3
(4840)
220 7.3
(22)
3 96.67% 1560
(4679)
213
Zeus 75% 10 1350 150 9 1 95.83% 1294 144

Notes
The values are for fully upgraded engines.
(Bracketed) values show the value for the train instead of the sortable values that are per train slot.
*Red values indicate averages based on an 8 hour servicing schedule (All values are rounded but Reliability is to 2)

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