Implementing railway route planning based on version 7.0

How to implement railway route planning? Can you provide relevant ideas? The original railway_routing branch cannot be used effectively and is not very compatible with version 7.0
public enum RoadClass {
OTHER(“other”), MOTORWAY(“motorway”),
TRUNK(“trunk”), PRIMARY(“primary”), SECONDARY(“secondary”),
TERTIARY(“tertiary”), RESIDENTIAL(“residential”), UNCLASSIFIED(“unclassified”),
SERVICE(“service”), ROAD(“road”), TRACK(“track”),
BRIDLEWAY(“bridleway”), STEPS(“steps”), CYCLEWAY(“cycleway”),
PATH(“path”), LIVING_STREET(“living_street”), FOOTWAY(“footway”),
PEDESTRIAN(“pedestrian”), PLATFORM(“platform”), CORRIDOR(“corridor”);

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