16-16  Basic Statistics on National Railways in Operation
Item	1985	1990	1995	2000	2005	2009	2010
Length of Railways in Operation                (km)	52119	53378	54616	58656	62200	65491	66239
In Formal Operation	49433	50310	50866	51262	57589	63789	64537
In Temporary Operation	2686	3068	3750	7394	4611	1702	1702
Proportion of the Length in Formal Operation	94.8	94.3	93.1	87.4	92.6	97.4	97.4
Double-Tracking Length                             (km)	9989	13024	16909	21408	24497	28682	29684
As Percentage of the Length of Railways	19.2	24.4	31.0	36.5	39.4	43.8	44.8
in Operation
Length of Electrified Railways                   (km)	4151	6941	9703	14864	19408	30243	32717
As Percentage of Railways in Operation	8.0	13.0	17.8	25.3	31.2	46.2	49.4
Length of Diesel Engine Routes                 (km)	10822	16097	24749	39497	42792	35249	33522
As Percentage of Railways in Operation	20.8	30.2	45.3	67.3	68.8	53.8	50.6
Length under Centralized Traffic Control (km)	1307	1169	1226	1200	1828	11588	17977
Automatic Blocking Length                         (km)	6921	10370	12910	18318	24149	31619	37500
Semi-automatic Blocking Length               (km)	42625	38832	40859	41695	39390	38615	37468
Length of Continuous Welded Rail            (km)	10439	14644	21854	29975	47965	68167	62954
Relay Interlocking Station                          (unit)						3449	3065
As Percentage of Stations in Operation						56.7	51.4
Computer Interlocking Station                  (unit)						2356	2792
As Percentage of Stations in Operation						38.7	46.9