What’s going on here?

All-round train aficionado Alstom’s stock tanked on Thursday.

What does this mean?

Trains are Alstom’s baguette and butter: the French company makes money by designing, making, and servicing trains like the Eurostar and metro systems in cities from Paris to Sydney. That heft has also won it major international projects, including the UK’s controversial high-speed HS2 train, which has been grabbing headlines after key planned coverage areas were cut off by the British government. But on Thursday, Alstom dropped a major truth bomb. Despite previously positive predictions, the company just forecasted that its free cash flow – that’s profit left after big project outlays – this year will wind up roughly $525 to $790 million in the negative. That got investors moving faster than those nippy trains: the firm’s share flew down by 37%, wiping over $3 billion off its valuation.

Why should I care?

For you: You can’t trust anyone these days.

Alstom’s quick one-eighty makes you wonder whether the firm was using a dartboard for its predictions. And this won’t just cast doubt on Alstom’s credibility: ripple effects could also impact its credit rating and shake investors’ long-term confidence, pushing them to steer clear of its shares and bonds. That’s a timely lesson: with the earnings season right around the corner, remember to take a company’s words with a grain of salt.

The bigger picture: Retail therapy doesn’t always help.

A handful of Alstom’s qualms can be tied to its acquisition of Bombardier's rail division three years ago, which has been far from a smooth ride. Initially valued at nearly $8 billion, the purchase was reduced by over $2 billion due to financial issues with Bombardier's UK and German projects. Plus, Bombardier came as a package deal with the British Aventra project, a fleet serving key lines like the London Overground. The project’s since been plagued by numerous delays and was a major factor in those reduced cash flow projections.

What’s going on here?

The world’s energy organizations engaged in some tough talking, with oil’s future taking the heat.

What does this mean?

Oil’s price has been pulled from side to side lately: a supply cut from OPEC – the group of oil-producing nations – fed speculation of heady prices, while the threat of a recession-fueled drop in demand did the opposite. And the International Energy Agency (IEA) poured more of the slippery stuff onto the flames, asserting that demand for oil is about to peak before falling off. But while the IEA would celebrate a shift toward renewable energy instead of fossil fuels, OPEC – representing economies that fully rely on oil – isn’t quite on board.

Why should I care?

For markets: A slippery trade.

Oil investors will be used to this to-ing and fro-ing – and if they're not, they should be. The elixir’s famously volatile, and swinging highs and lows are nothing new. Most of the time, the price rallies just when everyone expects the opposite, and vice versa. Case in point: oil oracles were predicting $100-a-barrel price tags a few days ago, just before prices plunged. So if you’re in it for the long haul, make sure you’ve got steady nerves.

The bigger picture: It ain’t easy being green.

That tumultuous trend makes it hard to predict oil’s future, both short and long-term. Even the industry’s onlookers are torn. Some believe the electric vehicle transition has already signaled the beginning of the end, given that transport makes up the majority of oil demand. But others reckon savvy oil companies could keep supply tight in an effort to pull up prices and make as much money as possible while they can, maintaining dominance over the market until the greater energy transition comes along.