
फ़्री में देखें
शर्तें लागू
सीज़न 1
5 एपिसोड
4. Steel Bridges
Steel bridges are extremely durable and multifunctional, fascinating not only due to its gigantic size but also because of the army of workers keeping the bridges in shape: whether on the historical landmark in Sydney or ultramodern mega bridges in China.
48मिन
6 जन॰ 2016
5. Railway Bridges
Railway bridges fascinate through different construction methods from masonry, truss-beam bridges to steel-concrete arch bridge. Heavier loads, faster speeds, more frequently: trains speed over bridges and the maintenance teams face ever larger challenges.
48मिन
6 जन॰ 2016



















