16-16  Basic Statistics on National Railways in Operation
Item	1985	1990	1995	2000	2003	2004
Length of Railways in Operation      (km)	52119	53378	54616	58656	60446	61015
In Formal Operation	49433	50310	50866	51262	56238	56822
In Temporary Operation	2686	3068	3750	7394	4208	4193
Proportion of the Length in Formal	94.8	94.3	93.1	87.4	93.0	93.1
Operation
Double-Tracking Length                    (km)	9989	13024	16909	21408	23702	23841
As Percentage of the Length of Railways	19.2	24.4	31.0	36.5	39.2	39.1
in Operation
Length of Electrified Railways          (km)	4151	6941	9703	14864	18060	18562
As Percentage of Railways in Operation	8.0	13.0	17.8	25.3	29.9	30.4
Length of Diesel Engine Routes        (km)	10822	16097	24749	39497	42387	42453
As Percentage of Railways in Operation	20.8	30.2	45.3	67.3	70.1	69.6
Length under Centralized Traffic Control (km)	1307	1169	1226	1200	1842	1842
As Percentage of Railways in Operation	2.5	2.2	2.2	2.0	3.1	3.0
Automatic Blocking Length              (km)	6921	10370	12910	18318	21920	22724
As Percentage of Railways in Operation	13.3	19.4	23.6	31.2	36.3	37.2
Semi-automatic Blocking Length     (km)	42625	38832	40859	41695	39522	39335
As Percentage of Railways in Operation	81.8	72.7	74.8	71.1	65.4	64.5
Length of Continuous Welded Rail (km)	10439	14644	21854	29975	39497	43198
As Percentage of the Trunk Lines	16.7	21.7	40.0	51.1	46.0	70.8
Number of Stations with Electric	2320	3535	4587	5232	5204	5340
Interlocking                                   (unit)
As Percentage of Railways Stations	46.9	62.9	73.9	90.4	92.9	95.1
in Operation