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MEASUREMENT OF LOOSENESS OF TIE BOLTS ON THE RAILWAY WITH LINE SENSOR CAMERA SYSTEM 
Yoshitaka Matsumoto 
CORE Co. Ltd. 
3-4-15-903 Mita , Minato-ku , Tokyo , 108 , Japan 
TEL: +81-3-3456-1911 FAX: +81-3-3453-4167 
Osamu Murakami 
CORE Co. Ltd. 
3-4-15-903 Mita , Minato-ku , Tokyo , 108 , Japan 
TEL: 481-3-3456-1911 FAX: +81-3-3453-4167 
Masaya Nakagawa 
Technical Center, East Japan Railway Company 
2-1-19 Hiro-machi , Shinagawa-ku , Tokyo , 104 , Japan 
TEL: +81-3-5709-3665 FAX: +81-3-5709-3666 
KEY WORDS: Line Sensor Camera , Railway maintenance , Measurement by camera 
ABSTRACT: 
For Railway camary , the maintenance of the railway tracks is ane of the most important subject to keep 
safe transportation. Especially , the railway tracks of the Sinkansen requires to pay much attertion 
for the maintenarce by it’s high speed traffics. At present , mest of mainterance for railway tracks 
are done by human's patrolling on foot , and it's difficult to detect wrong parts immediately. 
Under this circumstance , it is reguired to researching the detection method of the loosen tie bolts and 
springs on the railway tracks from photo or motion images . Recently , some effective results , to 
measure the looseness of the tie bolts and springs on the Shinkansen slab tracks from their images which 
were recorded by the Line Sensor Camera system , were acquired . 
This paper introduce the detail of the measuring system's constitution , and the method of how to measure 
the looseness of a tie bolt with the line sensor camera system. 
1. BACKGROUND 
  
Measureing line 
  
   
Track inspection can be roughly classified into the Rui m 
track irregularity and the track material. It had been 
developed that the synthetically high-speed track 
recording car for inspection of the track irregularity 
in automatically. 
  
     
Tie Bolt 
  
However , for the case of inspection of the track 
materials most of their inspections are still done by 
human eyes walking cn the railway tracks , because those 
are consisted on many items (Figure 1) , except for very 
few case like as the joint gap measurement system with 
image processing technology or the rail detector car 
with supersonic waves. 
  
  
  
Tio Plato 2mm fram Tie Plate Edge 
It is impossible to inspect the railway tracks in the Figure 1. Structure of the Railway 
daytime by high speed traffics of the Sinkansen. tying units 
Therefore , the inspection should be done in the night 
after passed the last train . And also, patralling on 
foot consumes too much time and manpower . By the 
reason of these , it is required to researching the 
method to detect to the loosen rail fastening unit , 
consisted on a tie bolt and a spring , on the railway 
tracks from photo images or motion images of them. 
IAPRS, Vol. 30, Part 5W1, ISPRS Intercommission Workshop “From Pixels to Sequences”, Zurich, March 22-24 1995 
  
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