Minimum S-curve radius min.s curve radius 120m minimum vertical curve radius min.curve radius (vertical) 2000m minimum horizontal curve radius min.curve radius (horizontal) 250m maximum gradient of the line max.line gradient35 ‰ minimum passing width of windshield min.gateway width1300mm minimum passing height of windshield min.gateway height1900mm weight of windshield 391 5kg (one set) fire and smoke standarddin 5510-2 noise attenuation levels ≥ 32dB heat transfer coefficient < 3.6 w / (m2. K)