To buy or sell Alstom shares, you have several options depending on your investment needs and preferences. You can use the services of online or traditional brokers to place your orders to buy or sell Alstom shares. If you prefer more flexibility in your investments, you can opt for a standard securities account to buy or sell Alstom shares. Finally, CFDs are financial derivatives that allow you to speculate on the price movement of Alstom shares without physically owning them. They can be used for short-term trading, but carry a higher level of risk.