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This chapter outlines the potential market of methane (especially LNG) as vehicle fuel in Europe and China.

A comprehensive report on the existing framework in terms of market capacity, regulations, and incentives is presented. Moreover, the feasibility of using biogas as environmental friendly source gas is considered.

The transport sector represents a major element in the global balance of greenhouse gas (GHG) emissions. Natural gas is considered the alternative fuel that, in the short-medium term, can best substitute conventional fuels in order to reduce their environmental impact, because it is readily available at a competitive price, using technologies that are already in widespread use. It can be used as compressed gas (CNG) or in the liquid phase (LNG). The former is more suitable for light vehicles, while the latter for heavy-duty vehicles. Some barriers need to be overcome for the diffusion of this alternative fuel, especially concerning the supply problem. The incentive policy has been shown to cover a major influence in the feasibility evaluation.

This work shows the state of the art of natural gas as fuel, especially from biogas source, in Europe and China and assesses the incentive scheme necessary to make liquefied biomethane feasible on the basis of the existing scenario in Italy.

The vehicle–track interaction and the resulting dynamic response of the vehicle involve a number of complex nonlinear problems. Large vertical loads act through a small contact patch leading to very high contact pressures. Transverse loads acting through this contact induce a relative velocity between wheel and rail expressed in non-dimensional form as a creepage. The wheel and rail profiles determine the contact patch shape and affect the ability of the vehicle to run stably. If the yaw stiffness of the axles is too low, the vehicle will become unstable at a relatively low speed; conversely, if the yaw stiffness is too high, the curving behaviour will be adversely affected. The vehicle suspension, especially the secondary suspension, also affects the ride comfort of passengers. Finally, it is shown how the speed profiles of accelerating and decelerating trains can be calculated from basic assumptions about the train power, adhesion and rolling resistance.