Basic Statistics on National Railways in Operation
Item	1978	1985	1990	1995	1998	1999
Length of Railways in Operation (km)	48618	52119	53378	54616	57584	57923
In Formal Operation	45539	49433	50310	50866	51397	51166
In Temporary Operation	3079	2686	3068	3750	6186	6756
Proportion of the Length in Formal	93.7	94.8	94.3	93.1	89.3	88.3
Operation
Double-Tracking Length (km)	7630	9989	13024	16909	19673	20925
As Percentage of the Length of Rail-	15.7	19.2	24.4	31.0	34.2	36.1
ways in Operation
Length of Electrified Railways (km)	1030	4151	6941	9703	12984	14025
As Percentage of Railways in Operation	2.1	8.0	13.0	17.8	22.5	24.2
Length of Diesel Engine Routes (km)	6550	10822	16097	24749	33974	36859
As Percentage of Railways in Operation	13.5	20.8	30.2	45.3	59.0	63.6
Length Under Centralized Traffic Control		1307	1169	1226	2344	1401
As Percentage of Railways in Operation		2.5	2.2	2.2	4.1	2.4
Automatic Blocking Length (km)	5981	6921	10370	12910	21042	17969
As Percentage of Railways in Operation	12.3	13.3	19.4	23.6	36.5	31.2
Semi-automatic Blocking Length (km)	34759	42625	38832	40859	41360	40788
As Percentage of Railways in Operation	71.5	81.8	72.7	74.8	71.8	70.4
Length of Continuous Welded Rail (km)	6530	10439	14644	21854	25979	27900
As Percentage of the Trunk Lines	12.2	16.7	21.7	40.0	32.9	34.7
Number of Stations with Electric	1336	2320	3535	4587	5184	5192
Interlocking (unit)
As Percentage of Railways Stations	27.7	46.9	62.9	73.9	89.9	90.1
in Operation