A tram runs in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Pan Yulong)

Passengers show their tram tickets in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Liu Changlong)

An attendant passes by a tram in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Liu Changlong)

People get on a tram in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Liu Changlong)

An attendant introduces the information of the tram network to a citizen in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Liu Changlong)

People prepare to get on a tram in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Pan Yulong)

A tram prepares to depart from the Taoxian airport stop in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Pan Yulong)

A tram prepares to depart from the Taoxian airport stop in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Pan Yulong)

A driver is seen in the cab of a tram in Hunnan New District of Shenyang, capital of northeast China's Liaoning Province, Aug. 15, 2013. The tram network in Hunnan New District, China's first modern tram network, including four lines with the total length of 60 kilometers, began trial operation on Thursday and is expected to be put into official operation on Sept. 15. (Xinhua/Pan Yulong)