1. Pick the shutter speed first
Underground, motion is the first risk: people walking, a train slowing down, your own hands. Both frames use 1/160 s. That was fast enough to keep walking passengers sharp at 35 mm while leaving the light for the aperture and ISO to share.
2. Open up, then raise ISO only as far as needed
With the shutter fixed, the aperture went close to wide open, f/2.8 for the platform and f/2.4 for the close detail, and ISO stayed at 320. On a modern sensor ISO 320 is clean; there was no need to go higher just to be safe.
3. Meter the platform, not the lights
The bright exit sign, the headlights and the illuminated C would pull an average reading down and leave the platform dark. Measure on the platform floor or a wall in the same light as your subject, then accept that the signs will be bright. With Obtura, use spot metering on the platform and keep the raw EV in view to compare readings.
4. Expect mixed colour
Fluorescent tubes, LED signs and headlights do not share one colour temperature. Decide which light should look neutral, usually the platform, and set white balance for it, or correct it later from a raw file. On film, choose the stock with that mix in mind and expect a cast from the tubes.
Try the workflow in Obtura
Obtura measures reflected light through the iPhone camera, with spot and average modes, and turns what you want into aperture, shutter and ISO for your phone or your manual camera. Its preview is simulated; judge results on your own camera. Available on the App Store, requires iOS 26 or later.
Source: Kodak Alaris, KODAK PROFESSIONAL PORTRA 400 Film technical data, E-4050, section on fluorescent and high-intensity discharge lamps.