Tractive Effort question

OpenTTD is a fully open-sourced reimplementation of TTD, written in C++, boasting improved gameplay and many new features.

Moderator: OpenTTD Developers

Post Reply
bando
Engineer
Engineer
Posts: 2
Joined: 27 Apr 2025 04:21

Tractive Effort question

Post by bando »

Something I can't figure out on the tractive effort page on the wiki:

in the final section, "A Combination of the Two" there's a box with a formula for tractive effort on an incline. The second line in the box reads:

800 (tons) * 3 (%) * 100 N = 240,000 N * 2 (incline length) / 10 (number shown in depot) = 48,000 N

What is the "number shown in depot"? I can't seem to find that in the game.
bando
Engineer
Engineer
Posts: 2
Joined: 27 Apr 2025 04:21

Tractive Effort questions

Post by bando »

Not sure where my first post on this topic disappeared to.

I've got a couple questions from the wiki article on Tractive Effort.

One is how you calculate the percentage of a slope. The formulas for inclines mention a 3% slope, but I'm not sure where you can find that information. A 50m climb counts as what % of slope?
eV_Vgen
Engineer
Engineer
Posts: 11
Joined: 13 Jul 2012 19:23

Re: Tractive Effort questions

Post by eV_Vgen »

bando wrote: 27 Apr 2025 13:26 One is how you calculate the percentage of a slope. A 50m climb counts as what % of slope?
You choose this value in the settings. In the physics tab you can change what a height of 1 tile will amount to in percentage for road vehicles or trains.
train_S.PNG
train_S.PNG (129.93 KiB) Viewed 1724 times
What is the "number shown in depot"? I can't seem to find that in the game.
It's the total number of cars on your train, including the engine. Basically, 1 car is 0.5 tile in length on vanilla settings. Here is how it looks in-game. The newGRF set with a varying car length makes calculations a little bit harder.
train_L.PNG
train_L.PNG (10.69 KiB) Viewed 1724 times
Post Reply

Return to “General OpenTTD”

Who is online

Users browsing this forum: Yisc and 5 guests