Table 1.

Main characteristics of the different line types.

Characteristics	Urban	Urban/Inter-City	Inter-City	High-Speed
Maximum speed (kph)	s ≤ 70	70 < s ≤ 160	160 < s < 250	≥250
Line length (km)	l ≤ 20	20 < l < 100	100 ≤ l < 250	l ≥ 250
Parallel tracks (units)	1	2	3	4
Rolling stock	Single	Similar	Mixed	Very Mixed
Stock types	1	2–4	5–8	9+
Train stations	1–5	6–20	21–50	51+
Operators	1	2	3–5	6+
Passengers (per km of line)	n < 100,000	100,000 ≤ n < 200,000	200,000 ≤ n < 500,000	n ≥ 500,000
Range of services	Single	Small diversity	Multiple variances	Extremely varied