Adhesion-limited starting effort

Code snippets

curl "https://api.oanor.com/railway-api/v1/adhesion" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/railway-api/v1/adhesion", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/railway-api/v1/adhesion");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/railway-api/v1/adhesion",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "However much power a locomotive has, it can only pull as hard as friction lets the wheels grip: the maximum starting tractive effort = the adhesion coefficient × the weight on the driving wheels. Dry steel-on-steel adhesion is ~0.25 (up to ~0.35–0.4 with sand and modern wheel-slip control), so 200 tons on the drivers gives about 100,000 lbf before the wheels spin. Heavier locomotives and sanders raise the ceiling.",
        "inputs": {
            "adhesion_coefficient": 0.25,
            "weight_on_drivers_tons": 200
        },
        "max_starting_tractive_effort_kn": 444.82,
        "max_starting_tractive_effort_lbf": 100000
    },
    "meta": {
        "timestamp": "2026-06-07T08:17:58.120Z",
        "request_id": "37ed67d0-ae47-4a5e-8995-ec3685d47ae8"
    },
    "status": "ok",
    "message": "Adhesion",
    "success": true
}